CN115236900A

CN115236900A - Backlight structure and display device

Info

Publication number: CN115236900A
Application number: CN202211146615.6A
Authority: CN
Inventors: 龙春平; 徐健; 朱贺玲
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-10-25
Anticipated expiration: 2042-09-21
Also published as: CN115236900B; CN117742037A; WO2024061232A1

Abstract

A backlight structure and a display device are provided. The backlight structure comprises a substrate, a retaining wall pattern and a plurality of light-emitting units. The retaining wall pattern comprises a plurality of openings arranged in an array along a first direction and a second direction and a retaining wall surrounding each opening, and the plurality of openings are configured to limit a plurality of lamp areas; the plurality of light emitting units are distributed in the plurality of lamp regions. The substrate comprises a middle area and an edge area surrounding the middle area, at least three light-emitting units are arranged in each lamp area located in the middle area, the centers of M light-emitting units closest to the vertex angle of each lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of each lamp area is smaller than 10% of the pitch of each lamp area, and included angles between each side of the first direction and each side of the M-shaped polygon and included angles between each side of the first direction and each side of the second direction and each side of the M-shaped polygon are larger than 0 degree. The utility model provides a backlight structure through the setting to the contained angle between limit of M limit and first direction and the second direction, is favorable to improving the light-emitting homogeneity in lamp district.

Description

Backlight structure and display device

Technical Field

The embodiment of the disclosure relates to a backlight structure and a display device.

Background

Display devices that are widely used at present include thin film transistor liquid crystal display (TFT-LCD) devices, which have advantages of long lifetime, high display brightness, large contrast, and wide color gamut.

Mini light emitting diodes (Mini LEDs) may be used as a backlight for a thin film transistor liquid crystal display device. When the Mini LED is used as a backlight source to be combined with a traditional liquid crystal display panel, the brightness of the Mini LED is controlled to be matched with the gray scale presented by the display panel, so that the liquid crystal display device has high contrast which is equivalent to that of an organic light emitting diode display device.

Disclosure of Invention

The embodiment of the disclosure provides a backlight structure and a display device.

An embodiment of the present disclosure provides a backlight structure, including: the light emitting device comprises a substrate, a retaining wall pattern and a plurality of light emitting units, wherein the retaining wall pattern is positioned on the substrate. The retaining wall pattern comprises a plurality of openings arranged in an array along a first direction and a second direction, and retaining walls surrounding the openings, wherein the openings are configured to define a plurality of lamp areas, and the first direction and the second direction are intersected; a plurality of light emitting units are distributed within the plurality of lamp zones. The substrate comprises a middle area and an edge area surrounding the middle area, at least three light-emitting units are arranged in each lamp area at least located in the middle area, the centers of M light-emitting units closest to the top angle of each lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of each lamp area is smaller than 10% of the pitch of each lamp area, and included angles between the first direction and each side of the M-shaped polygon and included angles between the second direction and each side of the M-shaped polygon are larger than 0 degree.

For example, according to the embodiment of the disclosure, the ratio of different side lengths of the M-shaped polygon is 0.9 to 1.1, and the ratio of the pitch of the lamp area to the side length of the M-shaped polygon is 1.7 to 2.3.

For example, according to the embodiment of the present disclosure, the pitch of the lamp regions is P, each lamp region of the at least part of the lamp regions comprises N light emitting units, N ≧ M, and the distance from the center of the ith light emitting unit to the top corner of the lamp region is L _i I ranges from 1 to N, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

For example, according to an embodiment of the present disclosure, the light emission intensity distribution I of the light emitting unit satisfies: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution in the direction perpendicular to the normal line of the light-emitting surface of the luminous unit, alpha is the included angle between the luminous direction of the luminous unit and the normal line, and m = (-ln 2)/(lncos alpha) _1/2 )，α _1/2 The included angle between the light emitting direction and the normal is formed when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction, and the optical path of the light emitted by the light emitting unit in the normal direction is h; each lamp zone of at least part of the lamp zones comprises N light-emitting units, N is more than or equal to M, and the distance from the center of the ith light-emitting unit to the top angle of the lamp zone is L _i I ranges from 1 to N, L _i H and N satisfy:

0.5≥{cosm×[(π/2)-(h/L ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]}≥0.23。

for example, according to the embodiment of the present disclosure, the ratio of the light intensity at the edge position of the lamp region to the light intensity at the center position of the lamp region is not less than 0.5.

For example, according to the embodiment of the disclosure, each of the at least part of the lamp regions includes at least four light emitting units, the at least four light emitting units are arranged in the M-sided polygon, and an included angle between one of the first direction and the second direction and at least one side of the M-sided polygon is 12 to 18 degrees.

For example, according to the embodiment of the present disclosure, each of the at least some lamp regions is shaped like a first square, each of the at least some lamp regions includes at least four light emitting units, the M-side is shaped like a second square, and an included angle between a diagonal line of the first square and a diagonal line of the second square is 12 to 18 degrees.

For example, according to an embodiment of the present disclosure, the shape of at least part of the lamp area comprises a rectangle in which two adjacent sides extend in the first and second directions, respectively.

For example, according to the embodiment of the present disclosure, the light emitting units disposed in each lamp region are electrically connected, and the retaining wall includes a light blocking material.

For example, according to an embodiment of the present disclosure, the light emitting unit includes a light emitting diode chip and a package structure configured to package the light emitting diode chip, and a space is disposed between the package structures of adjacent light emitting units.

For example, according to an embodiment of the present disclosure, a maximum dimension of the light emitting unit in a direction parallel to the substrate is not greater than 500 micrometers.

For example, according to the embodiment of the present disclosure, the at least four light emitting units include four light emitting units, and the centers of the four light emitting units are sequentially connected to form the second square.

For example, according to the embodiment of the present disclosure, the at least four light emitting units include five light emitting units, and the centers of four light emitting units located at the outermost edges of the five light emitting units are sequentially connected to form the second square.

For example, according to the embodiment of the present disclosure, each of the at least some lamp regions includes three light emitting units, centers of the three light emitting units are sequentially connected to form a triangle, and an included angle between one of the first direction and the second direction and one side of the triangle is less than 5 degrees.

For example, according to the embodiment of the present disclosure, the thickness of the dam is greater than the height of the light emitting unit in a direction perpendicular to the substrate.

For example, according to the embodiment of the disclosure, the thickness of the retaining wall is 200 to 400 micrometers, and the height of the light emitting unit is 50 to 100 micrometers.

For example, according to the embodiment of the disclosure, the thickness of the retaining wall is 250 to 270 micrometers, the width of the retaining wall is 350 to 500 micrometers, and the height of the light emitting unit is 80 to 100 micrometers.

For example, according to the embodiment of the present disclosure, the backlight structure further includes: and the flat glue is positioned between the retaining wall and the light-emitting units and between the two adjacent light-emitting units. The thickness of the flat glue is not smaller than the height of the light-emitting unit and smaller than the thickness of the retaining wall, the flat glue is close to the orthographic projection of one side surface of the substrate on the substrate and is completely located, the flat glue is far away from the orthographic projection of one side surface of the substrate on the substrate.

For example, according to the embodiment of the present disclosure, a cross-sectional shape of a plane where the flat adhesive is located by a central connecting line of the two adjacent light emitting units includes a trapezoid, a length of a first base side of the trapezoid away from the substrate is greater than a length of a second base side of the trapezoid close to the substrate, a distance between end points of orthographic projections of the first base side and the second base side on the substrate, the end points being close to each other, is 17 to 32 micrometers, and the plane is perpendicular to the substrate.

For example, according to the embodiment of the present disclosure, a side of the substrate away from the light emitting unit is provided with a thermal conductive adhesive, and the thermal conductive adhesive is provided with at least one opening.

For example, according to an embodiment of the present disclosure, the backlight structure further includes: and the light diffusion structure is positioned on one side of the light emitting unit, which is far away from the substrate. The light diffusion structure comprises at least one layer of diffusion film, and the thickness of the diffusion film is 0.05-0.2 mm.

For example, according to an embodiment of the present disclosure, the backlight structure further includes: and the color conversion structure is positioned on one side of the light diffusion structure far away from the light-emitting unit. The color conversion structure includes a color conversion film configured to convert first color light including blue light into second color light including at least one of red light and green light.

For example, according to an embodiment of the present disclosure, the color conversion structure further includes a prism located on a side of the color conversion film away from the light emitting unit.

For example, according to an embodiment of the present disclosure, the backlight structure further includes: and the prism structure is positioned on one side of the color conversion structure, which is far away from the light-emitting unit. The prism structure comprises at least one prism layer, and the thickness of the prism layer is 0.05 to 0.2 mm.

Another embodiment of the present disclosure provides a backlight structure, including: the light emitting device comprises a substrate, a retaining wall pattern and a plurality of light emitting units, wherein the retaining wall pattern is positioned on the substrate. The retaining wall pattern comprises a plurality of openings arranged in an array along a first direction and a second direction, and retaining walls surrounding the openings, wherein the openings are configured to define a plurality of lamp areas, and the first direction and the second direction are intersected; a plurality of light emitting units are distributed within the plurality of lamp zones. At least three light-emitting units are arranged in each of at least part of the lamp areas, the centers of M light-emitting units closest to the vertex angle of the lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of the lamp area is smaller than 10% of the pitch of the lamp area, the ratio of different side lengths of the M-shaped polygon is 0.9 to 1.1, and the ratio of the pitch of the lamp area to the side length of the M-shaped polygon is 1.7 to 2.3; at least one side of the M-polygon is parallel to at least one of the first direction and the second direction.

For example, according to an embodiment of the present disclosure, each of the at least some lamp zones comprises N light emitting units, N ≧ M, and a distance L from a center of an ith light emitting unit to a top corner of the lamp zone _i I ranges from 1 to N, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

For example, according to the embodiment of the present disclosure, the light emission intensity distribution I of the light emitting unit satisfies: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution in the direction perpendicular to the normal line of the light-emitting surface of the luminous unit, alpha is the included angle between the luminous direction of the luminous unit and the normal line, and m = (-ln 2)/(lncos alpha) _1/2 )，α _1/2 The included angle between the light emitting direction and the normal is formed when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction, and the optical path of the light emitted by the light emitting unit in the normal direction is h; each lamp zone of at least part of the lamp zones comprises N light-emitting units, N is more than or equal to M, and the distance from the center of the ith light-emitting unit to the vertex angle of the lamp zone is L _i I ranges from 1 to N, L _i H and N satisfy:

For example, according to the embodiment of the present disclosure, each of the at least some lamp regions includes at least four light emitting units, the at least four light emitting units are arranged in the M-polygon, and an included angle between one of the first direction and the second direction and at least one side of the M-polygon is 0 degree.

For example, according to the embodiment of the present disclosure, each of the at least partial lamp regions has a shape of a first square, each of the at least partial lamp regions includes at least four light emitting units, the M-side is a second square, and an angle between a diagonal of the first square and a diagonal of the second square is 0 degrees.

For example, according to the embodiment of the present disclosure, the at least four light emitting units include four light emitting units, and centers of the four light emitting units are sequentially connected to form the second square.

For example, according to the embodiment of the present disclosure, each of the at least some lamp regions includes three light emitting units, centers of the three light emitting units are sequentially connected to form a triangle, and one edge of the triangle extends along the first direction or the second direction.

For example, according to an embodiment of the present disclosure, the light emitting unit includes a light emitting diode chip and a package structure configured to package the light emitting diode chip, and a space is provided between the package structures of adjacent light emitting units.

For example, according to an embodiment of the present disclosure, the backlight structure further includes: and the flat glue is positioned between the retaining wall and the light-emitting units and between the two adjacent light-emitting units. The thickness of flat glue is not less than the height of luminescence unit, and is less than the thickness of barricade, the flat glue is close to base plate side surface is in orthographic projection on the base plate is located completely the flat glue is kept away from base plate side surface is in the orthographic projection on the base plate.

For example, according to the embodiment of the present disclosure, a cross-sectional shape of a plane where the flat glue is connected by the centers of the two adjacent light emitting units includes a trapezoid, a length of a first bottom side of the trapezoid away from the substrate is longer than a length of a second bottom side of the trapezoid close to the substrate, a distance between end points of orthographic projections of the first bottom side and the second bottom side on the substrate, the end points being close to each other, is 17 to 32 micrometers, and the plane is perpendicular to the substrate.

Another embodiment of the present disclosure provides a display device including: display panel and the backlight structure. The display panel is positioned on the light-emitting side of the backlight structure.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a schematic view of a partial plan structure of a backlight structure provided according to an example of the embodiment of the present disclosure.

Fig. 2A and 2B are schematic views of light emitting units in different examples.

Fig. 3A is a schematic diagram of equivalent luminescence of a lambertian illuminant.

Fig. 3B is a schematic diagram of the light exit angle and the light intensity distribution of the lambertian illuminant.

Fig. 4 is a schematic view of a partial cross-sectional structure taken along line AA' shown in fig. 1 according to an example in an embodiment of the present disclosure.

Fig. 5 is a schematic view of a light emitting unit in one of the lamp zones shown in fig. 1.

Fig. 6 to 9 are schematic diagrams of the distribution of light emitting units in one lamp area in different examples according to the embodiment of the present disclosure.

Fig. 10 is a schematic view of a partial plan structure of a backlight structure provided according to another example of the embodiment of the present disclosure.

Fig. 11 is a schematic view of a partial cross-sectional structure taken along the line BB' shown in fig. 10 according to an example of an embodiment of the present disclosure.

Fig. 12 is a schematic view of the light emitting units in one of the lamp zones shown in fig. 10.

Fig. 13A-13G are schematic diagrams of a lamp zone provided in accordance with another example of an embodiment of the present disclosure.

Fig. 14 is a graph showing the relationship between the relative light intensities at the edge positions of the lamp regions after the M-polygon in the lamp regions shown in fig. 13A to 13G is rotated by different angles.

Fig. 15A to 15G are schematic views of one lamp zone provided according to another example of the embodiment of the present disclosure.

Fig. 16 is a graph showing the relationship between the relative light intensity at the edge of the lamp area after the M-polygon in the lamp area shown in fig. 15A to 15G is rotated by different angles.

Fig. 17A to 17G are schematic views of one lamp zone provided according to another example of the embodiment of the present disclosure.

Fig. 18 is a graph showing the relationship between the relative light intensity at the edge of the lamp area after the M-polygon is rotated by different angles in the lamp areas shown in fig. 17A to 17G.

Fig. 19 is a schematic diagram of a distribution of light emitting units in one lamp zone in various examples according to an embodiment of the present disclosure.

Fig. 20 is a schematic partial cross-sectional view taken along line AA' shown in fig. 1, provided in accordance with another example of an embodiment of the present disclosure.

Fig. 21 is a schematic partial cross-sectional view taken along the line BB' of fig. 10 provided in accordance with another example of an embodiment of the present disclosure.

Fig. 22 is a schematic view of a partial cross-sectional structure taken along the line BB' shown in fig. 10 according to another example of an embodiment of the present disclosure.

Fig. 23 is a partial cross-sectional view of a backlight structure including the substrate, the dam, and the light emitting unit shown in fig. 11.

Fig. 24 is a schematic partial cross-sectional structure view of a display device according to another embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and the like in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

The terms "parallel," "perpendicular," and "the same" as used in the embodiments of the present disclosure include the strict meaning of "parallel," "perpendicular," "the same," and the like, as well as the meaning of "substantially parallel," "substantially perpendicular," "substantially the same," and the like, including the fact that certain errors, taken into account, are within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art in view of the error associated with measuring the particular value (e.g., the limitations of the measurement system). For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value. When the number of one component is not particularly specified in the following of the embodiments of the present disclosure, it means that the component may be one or more, or may be understood as at least one. "at least one" means one or more, and "a plurality" means at least two.

The disclosure provides a backlight structure and a display device. The backlight structure comprises a substrate, a retaining wall pattern and a plurality of light emitting units. The retaining wall pattern comprises a plurality of openings arranged in an array along a first direction and a second direction and a retaining wall surrounding each opening, and the plurality of openings are configured to limit a plurality of lamp areas; the plurality of light emitting units are distributed in the plurality of lamp regions. The substrate comprises a middle area and an edge area surrounding the middle area, at least three light-emitting units are arranged in each lamp area located in the middle area, the centers of M light-emitting units closest to the vertex angle of each lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of each lamp area is smaller than 10% of the pitch of each lamp area, and included angles between each side of the first direction and each side of the M-shaped polygon and included angles between each side of the first direction and each side of the second direction and each side of the M-shaped polygon are larger than 0 degree.

The utility model provides a backlight structure through the setting to the contained angle between limit of M limit and first direction and the second direction, is favorable to improving the light-emitting homogeneity in lamp district.

The present disclosure also provides another backlight structure. The backlight structure comprises a substrate, a retaining wall pattern and a plurality of light emitting units. The retaining wall pattern comprises a plurality of openings arranged in an array along a first direction and a second direction and a retaining wall surrounding each opening, and the plurality of openings are configured to limit a plurality of lamp areas; the plurality of light emitting units are distributed in the plurality of lamp regions. At least three light-emitting units are arranged in each of at least part of the lamp areas, the centers of M light-emitting units closest to the vertex angle of the lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of the lamp area is smaller than 10% of the pitch of the lamp area, the ratio of different side lengths of the M-shaped polygon is 0.9-1.1, and the ratio of the pitch of the lamp area to the side length of the M-shaped polygon is 1.7-2.3; at least one side of the M-sided polygon is parallel to at least one of the first direction and the second direction.

The utility model provides a backlight structure, through to the setting of the length of a side of M limit and lamp zone pitch relation, the setting of the center of M limit and the central point of lamp zone put the relation and the limit of M limit is parallel with at least one of first direction and second direction, is favorable to improving lamp zone light-emitting homogeneity.

The backlight structure and the display device provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

Fig. 1 is a schematic view of a partial plan structure of a backlight structure provided according to an example of the embodiment of the present disclosure. As shown in fig. 1, the backlight structure includes a substrate 100, a dam pattern 200 disposed on the substrate 100, and a plurality of light emitting units 310. The barrier pattern 200 includes a plurality of openings 210 arranged in an array along a first direction and a second direction, the plurality of openings 210 being configured to define a plurality of lamp regions 300, and a barrier 220 surrounding each of the openings 210, the first direction intersecting the second direction. The plurality of light emitting units 310 are distributed in the plurality of lamp regions 300. At least three light-emitting units 310 are arranged in each lamp area 300 of at least part of the lamp areas 300, the centers of M light-emitting units 310 closest to the top corner of the lamp area 300 in the at least three light-emitting units 310 are sequentially connected to form an M-polygon, and the distance between the center C1 of the M-polygon and the center C2 of the lamp area 300 is less than 10% of the pitch P of the lamp area 300; the ratio of different side lengths of the M-shaped polygon is 0.9 to 1.1, and the ratio of the pitch P of the lamp area 300 to the side length P' of the M-shaped polygon is 1.7 to 2.3; at least one side of the M-sided polygon is parallel to at least one of the first direction and the second direction.

This is disclosed through the setting of the length of a side of M limit and lamp district pitch relation, the setting of the central point position relation of M limit and lamp district and the limit of M limit and first direction and second direction at least one parallel, is favorable to improving lamp district light-emitting homogeneity.

For example, one of the first direction and the second direction may be an X direction shown in fig. 1, and the other of the first direction and the second direction may be a Y direction shown in fig. 1, and the embodiment of the present disclosure is schematically described with the first direction being the X direction and the second direction being the Y direction.

For example, the first direction and the second direction are perpendicular.

For example, the included angle between the first direction and the second direction may be 80 to 110 degrees, 85 to 100 degrees, or 88 to 92 degrees. The embodiments of the present disclosure are not limited thereto, and the first direction and the second direction may be interchanged.

For example, as shown in fig. 1, a plurality of openings 210 correspond one-to-one to a plurality of lamp zones 300, each opening 210 for defining one lamp zone 300.

For example, the number of the light emitting units 310 distributed in different lamp regions 300 may be the same or different.

For example, in the embodiment of the present disclosure, it is schematically shown that the number of the light emitting units distributed in different lamp zones is the same, and the arrangement shapes of the light emitting units in each lamp zone are the same, so as to improve the light emitting uniformity of the backlight structure.

For example, as shown in fig. 1, a plurality of lamp regions 300 are uniformly distributed, and a plurality of light emitting units 310 on the substrate 100 are uniformly distributed.

For example, the number of the light emitting units 310 distributed in a part of the lamp zones 300 in one area on the substrate 100 is the same, the number of the light emitting units 310 distributed in a part of the lamp zones 300 in another area on the substrate 100 is different, the position arrangement of the one area and the another area can be set according to the product requirement, the one area can be located in the center area of the substrate, and the another area can be the edge area of the substrate; or the one region may be located at an edge region of the substrate and the other region may be located at a central region of the substrate; or both the one region and the other region may be located at different edge regions of the substrate.

For example, as shown in fig. 1, M is not greater than the number of light emitting units 310 provided in each lamp zone 300. For example, the M-polygon may be a triangle, a quadrilateral, a hexagon, etc., which are not limited by the embodiments of the present disclosure.

For example, as shown in fig. 1, at least three light emitting units 310 are disposed in each lamp zone 300 of all the lamp zones 300.

For example, three light emitting units 310, or four light emitting units 310, or five light emitting units 310, or six light emitting units 310, etc. may be provided per lamp region 300.

For example, as shown in fig. 1, the shape of the lamp area 300 may be a polygon, such as a triangle, a quadrangle, or a hexagon.

The center of the light-emitting unit refers to a geometric center of the light-emitting unit, for example, an orthographic projection of the geometric center on the substrate coincides with a center of a two-dimensional plane of the orthographic projection of the light-emitting unit on the substrate. The above-mentioned sequential connection of the centers of the M light emitting units may refer to a clockwise or counterclockwise connection of the centers of the M light emitting units.

For example, as shown in fig. 1, the pitch P of the lamp regions 300 may be the length of the center-line of the adjacent lamp regions 300 arranged in the first direction, or the length of the center-line of the adjacent lamp regions 300 arranged in the second direction. For example, the ratio of the pitch of the lamp area 300 in the first direction to the pitch of the lamp area 300 in the second direction is 0.9 to 1.1, and the pitches of the lamp area 300 in the two directions may be equal.

For example, as shown in fig. 1, the distance between the center C1 of the M-polygon and the center C2 of the lamp region 300 is less than 9.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 9% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 8.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 8% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 7.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 7% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 6.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 6% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 5.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 4.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 4% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 3.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 3% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 2.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 2% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 1.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 1% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 0.5% of the pitch P of the lamp region 300.

For example, as shown in fig. 1, the center C1 of the M-gon coincides with the center C2 of the lamp region 300.

For example, as shown in fig. 1, the ratio of the different side lengths of the M-polygon is 0.98 to 1.08.

For example, the ratio of the different sides of the M-polygon is 0.96 to 1.04.

For example, the ratio of the different side lengths of the M-sided polygon is 0.95 to 1.05. For example, the ratio of the different side lengths of the M-sided polygon is 0.92 to 1.02.

For example, as shown in FIG. 1, the sides of the M-sided polygon are equal and are P'.

For example, as shown in fig. 1, the ratio of the pitch P of the lamp area 300 to the side length P' of the M-polygon is 1.7 to 2.3. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.65 to 2.25. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-shaped polygon is 1.7 to 2.2. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.75 to 2.15. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.8 to 2.1. For example, the ratio of the pitch P of the lamp area 300 to the side length P' of the M-shaped polygon is 1.85 to 2.05. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-sided polygon is 1.9 to 2.

For example, as shown in FIG. 1, the pitch P of the lamp region 300 is 2 times the side length P' of the M-sided polygon.

For example, as shown in fig. 1, at least one side of the M-polygon is parallel to at least one of the first direction and the second direction.

For example, the M-polygon may include only sides parallel to the first direction, or the M-polygon may include only sides parallel to the second direction, or the M-polygon may include both sides parallel to the first direction and sides parallel to the second direction.

Fig. 2A and fig. 2B are schematic diagrams of the light-emitting unit in different examples, fig. 3A is a schematic diagram of equivalent light emission of a lambertian illuminant, and fig. 3B is a schematic diagram of light-emitting angle and light intensity distribution of the lambertian illuminant.

For example, as shown in FIGS. 3A to 3B, when the emission intensity of an extended light source is dI ℃. (cos)mAlpha, i.e. its brightness is independent of direction, this type of emitter is called a cosine emitter, or lambertian (j.h. lambert) emitter, and the above-mentioned law of luminous flux with cos alpha is called lambertian cosine law. Wherein dI is each surface element dS of the extended light surface along a certain directionrAlpha is the light emitting direction of the light sourcerFrom the normalnThe included angle of (c).

The light intensity distribution satisfies:I _α =I _O cosmα，I _O m = (-In 2)/(Incos α) for the luminous intensity distribution In the normal direction perpendicular to the light source surface _1/2 ) I.e. m is defined by a _1/2 Determining where α _1/2 Defined as the light emission direction and normal line when the light emission intensity is reduced to half of the light emission intensity corresponding to the normal line directionnAngle of (a) _1/2 The value range of (a) is 40 DEG to 80 DEG, such as alpha _1/2 Can range from 48 DEG to 75 DEG, e.g., alpha _1/2 Can range from 46 DEG to 78 DEG, e.g. alpha _1/2 The range of values can be 45-76 degrees. That is, if along the normalnThe light intensity of the light rays emitted in the direction is 1 and is equal to the normalnIs alpha _1/2 The light intensity of the emergent light is 1/2, and the emergent direction is along the normal linenIs greater than alpha _1/2 The light intensity of the light is small. That is, while Lambertian emitters can theoretically emit countless rays, the normal linenThe light beams with different included angles have different light intensities.

In some examples, as shown in fig. 2A, the light emitting unit 310 includes a light emitting diode chip 323 and an encapsulation structure 324 configured to encapsulate the light emitting diode chip 323, with a space provided between the encapsulation structures 324 of adjacent light emitting units 310.

For example, as shown in fig. 2A, the light emitting unit 310 includes a packaged light emitting diode chip, wherein the light emitting diode chip 323 may be a sub-millimeter light emitting diode chip (miniLED), the size of the unpackaged light emitting diode chip 323 in a direction perpendicular to the substrate 100 may be 70 micrometers to 180 micrometers, and the largest size of the unpackaged light emitting diode chip 323 in a direction parallel to the substrate 100 is not greater than 500 micrometers.

For example, the packaged led chip is the light emitting unit 310, and the maximum size and thickness of the packaged led chip 323 in the direction parallel to the substrate 100 are larger than those of the unpackaged led chip 323.

For example, as shown in fig. 2A, a single led chip 323 may be packaged as a separate device to form the light emitting unit 310, and then placed at a corresponding position on the backlight structure, and fixedly connected to a pad on the substrate 100.

Since the unpackaged led chip can be regarded as a lambertian illuminant, when the unpackaged led chip is packed, the light-emitting angle is in the range of + α _1/2 To-alpha _1/2 The internal light can be emitted, and + alpha _1/2 To-alpha _1/2 The external light is substantially confined in the independent device by total reflection, and at this time, an included angle θ between the edge-most light of the light emitted from the light emitting unit 310 and the substrate 100 may be α _1/2 The complementary angle of (c).

For example, as shown in fig. 2A, the light emitting unit 310 or the light emitting diode chip 323 is connected to the pad 321 on the substrate 100 through the bonding metal 322.

For example, the weld metal 322 may include solder.

For example, as shown in fig. 2A, the encapsulation structure 324 may be doped with a color conversion material 325.

For example, the color conversion material 325 may include a phosphor material or a quantum dot material.

For example, the color conversion material 325 may include a material that converts blue light into white light.

For example, color converting material 325 may include a material that converts blue light into red and green light. Of course, the embodiments of the present disclosure are not limited thereto, and the color conversion material may be doped in the package structure.

For example, as shown in fig. 2A, the led chip 323 may be placed at a corresponding position on the substrate 100 and then packaged.

For example, each led chip may be packaged by a screen printing or dot printing method using a transparent material, such as a transparent silicon gel, to form a package structure 324, and the light emitting angle of the led chip 323 may be modulated according to the shape of the package structure 324, so as to change the light emitting angle of the light emitting unit 310.

For example, as shown in fig. 2A, a surface of the package structure 324 far from the substrate 100 may be a curved surface, and an angle of light extraction of an edge-most light of the light rays emitted by the light emitting unit 310 is slightly larger than α of the led chip 323 _1/2 If α is _1/2 The value range of (a) is 40 to 65 °, the value range of the light-emitting angle of the marginal light ray among the light rays emitted by the light-emitting unit 310 may be 50 to 70 °.

For example, the package structure 324 may have any desired dimension in a direction perpendicular to the substrate 100. For example, the dimension of the encapsulation structure 324 in the direction perpendicular to the substrate 100 may be less than 0.5 mm. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.1 and 0.4 millimeters. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.2 and 0.4 millimeters. For example, the dimension of the package structure 324 in the direction perpendicular to the substrate 100 may be less than 0.3 mm. For example, the dimension of the package structure 324 in the direction perpendicular to the substrate 100 may be between 0.25 mm and 0.35 mm. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.15 and 0.25 millimeters. For example, the dimension of the package structure 324 in a direction perpendicular to the substrate 100 may be about 0.2 millimeters. For example, the dimension of the package structure 324 in a direction perpendicular to the substrate 100 may be about 0.3 mm.

For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 2.5 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 2.5 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 0.7 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.8 and 0.9 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be greater than 0.5 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be greater than 1.0 millimeter. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be greater than 2.0 millimeters. For example, the largest dimension of the package structure 324 in a direction parallel to the substrate 100 may be less than 2.0 millimeters, and the like.

For example, the ratio of the largest dimension of the encapsulation structure 324 in the direction parallel to the substrate 100 to the dimension thereof in the direction perpendicular to the substrate 100 may be greater than 3. For example, the ratio of the largest dimension of the encapsulation structure 324 in the direction parallel to the substrate 100 to the dimension thereof in the direction perpendicular to the substrate 100 may be between 4 and 6. For example, the ratio of the largest dimension of the encapsulation structure 324 in the direction parallel to the substrate 100 to the dimension thereof in the direction perpendicular to the substrate 100 may be less than 10.

For example, after being packaged as an independent device, the geometric center of the led chip in the orthographic projection of the substrate may coincide with the geometric center of the independent device in the orthographic projection of the substrate, but is not limited thereto, and the geometric center of the led chip in the orthographic projection of the substrate may also be offset with respect to the geometric center of the independent device in the orthographic projection of the substrate; the height of the light emitting unit 310 in a direction perpendicular to the substrate 100 is the height of the packaged light emitting diode chip.

For example, as shown in fig. 2A, the size of the light emitting cell 310 in the direction perpendicular to the substrate 100 is not greater than 200 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 180 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 160 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 150 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 140 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 130 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 120 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 110 μm. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 100 micrometers. The size of the light emitting unit 310 in the direction perpendicular to the substrate 100 is the height of the light emitting unit 310.

In some examples, as shown in fig. 2A, the height of the light emitting unit 310 is 50 to 100 micrometers.

In some examples, as shown in fig. 2A, the height of the light emitting unit 310 is 80 to 100 micrometers.

For example, the height of the light emitting unit 310 is 55 to 95 micrometers. For example, the height of the light emitting unit 310 is 60 to 90 micrometers. For example, the height of the light emitting unit 310 is 70 to 85 micrometers. For example, the height of the light emitting unit 310 is 75 to 80 μm.

In some examples, as shown in fig. 1 to 2A, the maximum dimension of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 500 micrometers. For example, the maximum dimension of the light emitting unit 310 in a direction parallel to the substrate 100 is not more than 450 micrometers. For example, the maximum dimension of the light emitting unit 310 in a direction parallel to the substrate 100 is not more than 400 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 350 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 330 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 300 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 280 micrometers.

For example, as shown in fig. 1, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 250 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 240 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 230 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 220 micrometers. For example, the light emitting cells 310 have a size of 219 μm in both the first direction and the second direction.

The shape of the light emitting unit may refer to a shape of an orthographic projection of the light emitting unit on the substrate.

For example, the shape of the light emitting unit may be a quadrangle, such as a rectangle, and the maximum dimension of the light emitting unit in a direction parallel to the substrate may be the length of a diagonal of the quadrangle.

For example, the shape of the light emitting unit may be an ellipse, and the maximum size of the light emitting unit in a direction parallel to the substrate may be the length of the major axis of the ellipse.

For example, the shape of the light emitting unit may be circular, and the maximum size of the light emitting unit in a direction parallel to the substrate may be a diameter.

For example, as shown in fig. 2B, the light emitting unit 310 may also include only the unpackaged light emitting diode chip 323, and the largest dimension of the unpackaged light emitting diode chip 323 in a direction parallel to the substrate 100 is not greater than 500 micrometers.

For example, the light emitting unit 310 is an unpackaged light emitting diode chip 323, wherein the light emitting diode chip 323 is a sub-millimeter inorganic light emitting diode (miniLED), the unpackaged light emitting diode chip 323 has a thickness of 70 micrometers to 180 micrometers, and a maximum dimension of the unpackaged light emitting diode chip 323 in a direction parallel to the substrate 100 is not greater than 500 micrometers.

For example, the unpackaged led chips 323 can be equivalent to a lambertian emitter due to the emission of the unpackaged led chips 323 along and normal to the chipnIs greater than alpha _1/2 The light intensity of the light is small, and is not in the discussion scope of the present disclosure, so the embodiment of the present disclosure uses the light from the normal of the unpackaged led chip 323nIs alpha _1/2 Defined as the edge-most light of the unpackaged led chip 323A line, which is the edgemost light of the light emitting unit 310.

For example, as shown in fig. 2B, a side of the plurality of light emitting units 310 away from the substrate 100 is provided with a protective layer 326.

For example, in order to prevent the light emitting diode chips 323 from being scratched and knocked during subsequent processes, such as placing an optical film on the substrate 100 or transportation, the protective layer 326 may be used to uniformly protect the plurality of light emitting diode chips 323.

For example, a plurality of led chips 323 may share the same protective layer 326. For example, the protection layer 326 may be made of a transparent material, such as transparent silicone. For example, the protective layer 326 may fill the lamp region.

For example, the surface of the protection layer 326 away from the substrate 100 may be an almost flat surface, thereby improving the yield of the display device.

For example, in order to reduce the total reflection of the light emitted from the led chip 323 in the protective layer 326, the refractive index of the protective layer 326 may be between the refractive index of the led chip 323 and the refractive index of the material (e.g., air) adjacent to the protective layer 326.

For example, the refractive index of the protective layer 326 may be between 1.2 and 1.6. For example, the protective layer 326 may have a refractive index between 1.3 and 1.4. For example, the protective layer 326 has a refractive index of less than 1.4. For example, the protective layer 326 may have a refractive index less than 1.5. For example, the protective layer 326 may have a refractive index greater than 1.1. For example, the protective layer 326 may have a refractive index greater than 1.2. For example, the protective layer 326 may have a refractive index greater than 1.3. For example, the protective layer 326 may have a refractive index of about 1.35. For example, the protection layer 326 may cover all the unpackaged light emitting diode chips 323 on the substrate 100, and the protection layer 326 may have a flat or slightly concave-convex upper surface. For example, the thickness of the protection layer 326 is slightly larger than that of the unpackaged led chip 323.

In some examples, as shown in fig. 4, the thickness of the dam 220 is greater than the height of the light emitting unit 310 in a direction perpendicular to the substrate 100.

In some examples, as shown in fig. 4, the thickness of the retaining wall 220 is 200 to 400 micrometers, and the height of the light emitting unit 310 is 50 to 100 micrometers.

The thickness of the wall 220 refers to the dimension of the wall 220 in the direction perpendicular to the substrate 100.

In some examples, as shown in fig. 4, the thickness of the retaining wall 220 is 250 to 270 micrometers.

For example, the thickness of the retaining wall 220 may be 210 to 390 μm. For example, the thickness of the retaining wall 220 may be 220 to 370 micrometers. For example, the thickness of the retaining wall 220 may be 230 to 350 micrometers. For example, the thickness of the retaining wall 220 may be 235 to 320 micrometers. For example, the thickness of the retaining wall 220 may be 240 to 300 micrometers. For example, the thickness of the retaining wall 220 may be 245 to 280 micrometers.

In some examples, as shown in fig. 4, the width of the retaining wall 220 is 350 to 500 micrometers. The width of the retaining wall 220 refers to the size of the retaining wall 220 between two adjacent light regions 300 in the first direction, or the size of the retaining wall 220 between two adjacent light regions 300 in the second direction.

For example, as shown in fig. 4, the width of the retaining wall 220 may be 370 to 480 micrometers. For example, the width of the retaining wall 220 may be 350 to 450 micrometers. For example, the width of the retaining wall 220 may be 360 to 440 micrometers. For example, the width of the retaining wall 220 may be 370 to 430 micrometers. For example, the width of the retaining wall 220 may be 380 to 420 micrometers. For example, the width of the retaining wall 220 may be 390 to 410 μm. For example, the width of the retaining wall 220 may be 400 microns.

In some examples, as shown in fig. 1 and 4, the retaining wall 220 includes a light blocking material.

For example, the material of the retaining wall 220 may include black resin.

In some examples, as shown in fig. 1, the light emitting cells 310 disposed in each lamp zone 300 are electrically connected. For example, the plurality of light emitting cells 310 in each lamp region 300 are connected in series. For example, the plurality of light emitting cells 310 in each lamp region 300 are connected in parallel.

In the backlight structure that this disclosure provided, through the barricade around the round shading in every lamp district outside, be favorable to reducing the probability that light takes place to cross talk between the different lamp districts, improve the halo phenomenon.

In some examples, as shown in fig. 1, the shape of at least a portion of the lamp region 300 comprises a rectangle in which adjacent sides extend in a first direction and a second direction, respectively.

For example, all of the lamp regions 300 are rectangular in shape.

For example, the different lamp zones 300 are the same shape and size. Of course, the embodiments of the present disclosure are not limited thereto, and the substrate may be divided into a plurality of regions according to product requirements, the sizes of the lamp regions in different regions may be different, and the sizes of the lamp regions in the same region are the same.

Fig. 5 is a schematic view of a light emitting unit in one of the lamp zones shown in fig. 1. Fig. 5 schematically shows that one lamp area includes four light emitting cells, and the M-edge is a quadrangle.

For example, as shown in fig. 5, one lamp area 300 may be square, and an M-shape formed by connecting centers of four light emitting units 310 in the lamp area 300 is square.

For example, withI _α =I _O cosmα is formula 1, and m = (-In 2)/(Incos α) _1/2 ) Is the formula 2, alpha _1/2 The range of (c) can be 45-75 degrees, such as 60 degrees, and m can be obtained _min =0.5，m _max And (5) =2. For example, the vertical component of the exit optical path of a light-emitting unit, such as the normal shown in FIG. 3AnThe optical path length h in the direction may be 100 to 350 μm. For example, h can be 120 to 330 micrometers. For example, h can be 150 to 300 micrometers. For example, h may be 170 to 280 microns. For example, h can be 200 to 250 micrometers. H is equal to the height difference between the height of the retaining wall and the height of the light-emitting unit, such as the vertical height difference from the surface of the light-emitting unit far away from the substrate to the highest point of the retaining wall.

For example, as shown in fig. 5, taking the length of the pitch P of the lamp region 300 as P and the distance between the center of the light emitting unit 314 and the center of the light emitting unit 313 as P/2 as an example, L ₂ 、L ₄ And P satisfies L ₂ =L ₄ =[(3×P/4) ² +(P/4) ² ] ^1/2 =(10) ^1/2 ×P/4；L ₁ And P satisfies: l is a radical of an alcohol ₁ =(2) ^1/2 ×P/4；L ₃ And P satisfies: l is a radical of an alcohol ₃ =3×(2) ^1/2 XP/4. L above ₁ 、L ₂ 、L ₃ 、L ₄ Refers to the horizontal distance from the center of the corresponding light emitting unit 310 to the top corner of the lamp zone.

For example, as shown in fig. 3A and 5, θ is the complement of α, i.e., θ =90 ° - α, tan θ = h/L, cosmα=sinm[(π/2)-α]. For example, the light emitting unit 310, e.g., alpha of a packaged light emitting diode chip _1/2 Can be 60 deg., then m ≈ 1.

For example, since h is on the order of microns and L is on the order of millimeters, L>>h, so θ is small, when tan θ ≈ θ = h/L, α approaches 90 degrees, cos α = sin θ ≈ tan θ = h/L. Since m ≈ 1,cosm α = sin (90 ° -mα)≈sin[m×(90°-α)]Sin (m × θ) ≈ m × sin θ ≈ m × h/L. Thus, the light intensity I at the E1 position shown in FIG. 5 ₁ =I ₀ cos（mα ₁ ）+I ₀ cos（mα ₂ ）+…+I ₀ cos（mα _N ）≈I ₀ ×m×h/L ₁ +I ₀ ×m×h/L ₂ +…+I ₀ ×m×h/L _N =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) N is the number of light emitting units in the lamp area, and N may be 4 as shown in fig. 5.

The above relation 1: i is ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) Can also be expressed as

. The above relation 1 represents a summation relation of corresponding values of N light emitting units in the lamp area.

Mixing the above L ₂ 、L ₄ 、L ₁ And L ₃ Substituted into the above formula to obtain I ₁ ≈I ₀ ×m×h/[2×(10) ^1/2 ×P/4+(2) ^1/2 ×P/4+3×(2) ^1/2 ×P/4]=6.3×I ₀ ×m×h/P。

For example, the light intensity I at the E2 position shown in FIG. 5 ₂ ≈4×I ₀ ×m×h/[(2) ^1/2 ×P/4]=11.3×I ₀ ×m×h/P。

For example, I ₁ /I ₂ =0.56。

In some examples, as shown in fig. 5, the ratio of the light intensity at the edge position of the lamp area 300, e.g., the E1 region, to the light intensity at the center position of the lamp area 300, e.g., the E2 region, is not less than 0.5.

For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.55. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.6. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.65. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.7. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.75. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.8. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.85. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.9.

In some examples, as shown in FIG. 5, I in relation 1 above ₀ M, h can be regarded as constants, each lamp zone 300 of at least some lamp zones 300 comprises N light-emitting units, N is larger than or equal to M, and the distance from the center of the ith light-emitting unit 310 to the top corner of the lamp zone 300 is L _i I ranges from 1 to N, L _i P and N satisfy: 8.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.3. Wherein P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Can be used as an approximate reference value for the unitless relative light intensity at the edge position. 1/L of the above ₁ +1/L ₂ +…+1/L _N L of N light-emitting units _N The sum of the reciprocal.

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) More than or equal to 6.5. For example, 8.1. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.6. For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.7. For example, 8 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) More than or equal to 6. For example, 7.9. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) More than or equal to 6.9. For example, 7.8 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 7. For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.8. For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 7.1. For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 7.2. For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥7.3。

The top angle of the lamp region may be referred to as the E1 region shown in fig. 5.

The above relational expression 8.5. Gtoreq.P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.3 can also be expressed as

. Wherein

. The above-mentioned relation represents a summation relation of corresponding values of the N light-emitting units in the lamp region.

For example, as shown in fig. 5, the lamp region 300 includes 4 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 4, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ ) Not less than 6.3. For example, P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ )=6.3。

For example, as shown in fig. 1, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.9 to 2.

In some examples, as shown in fig. 1 and 5, each of the lamp regions 300 of at least some of the lamp regions 300 includes at least four light emitting cells 310, the at least four light emitting cells 310 are arranged in an M-sided polygon, and an angle between one of the first direction and the second direction and at least one side of the M-sided polygon is 0 degree.

For example, as shown in FIG. 1, at least a portion of the lamp region 300 is square in shape.

In some examples, as shown in fig. 1, each lamp region 300 of at least some of the lamp regions 300 has a shape of a first square, each lamp region 300 of at least some of the lamp regions 300 includes at least four light emitting units 310, centers of four light emitting units 310 closest to four corners of the lamp region 300 among the at least four light emitting units 310 are sequentially connected to form a second square, and an angle between a diagonal of the first square and a diagonal of the second square is 0 degree.

For example, a diagonal of a first square may coincide with a diagonal of a second square.

In some examples, as shown in fig. 1, the at least four light emitting units 310 include four light emitting

units

311, 312, 313, and 314, and centers of the four light emitting

units

311, 312, 313, and 314 are sequentially wired to form a second square.

For example, two sides of the second square form an angle of 0 degrees with the first direction, and the other two sides of the second square form an angle of 0 degrees with the second direction.

For example, as shown in fig. 1, a plurality of light emitting cells 310 in a lamp area 300 are uniformly distributed.

For example, as shown in fig. 1 and 5, the pitch of the lamp regions 300 is 4.46 mm, the pitch of the light emitting units 310 is 2.23 mm, and the size of the light emitting units 310 may be 0.22mm × 0.22mm. For example, the number of the lamp regions 300 may be 2596, e.g., the number of the lamp regions 300 arranged in one of the first and second directions may be 44, and the number of the lamp regions 300 arranged in the other of the first and second directions may be 59. For example, the size of the lamp region 300 provided on the substrate may be 263mm × 196mm.

For example, the total thickness of the lamp panel formed by the substrate 100, the light emitting unit 310, the retaining wall pattern 200, and the like may be 0.27 mm.

In some examples, as shown in fig. 1, 3A, and 5, the light emitting unit 310 has a light emission intensity distribution I satisfying: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution perpendicular to the normal direction of the light-emitting surface of the light-emitting unit 310, α is the angle between the light-emitting direction of the light-emitting unit 310 and the normal, and m = (-ln 2)/(lncos α) _1/2 )，α _1/2 The light emitting unit 310 emits light with an optical path length h in the normal direction, which is an angle between the normal and the light emitting direction when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction; each lamp area 300 of at least part of the lamp areas 300 comprises N light-emitting units 310, N is more than or equal to M, and the distance from the center of the ith light-emitting unit 310 to the top corner of the lamp area 300 is L _i I ranges from 1 to N, L _i H and N satisfy: 0.5. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.23。

For example, as shown in fig. 3A and 5, when the outgoing light angle θ of the light-emitting unit 310 is small, tan θ ≈ θ = h/L, and tan θ ≈ θ = h/L and α = (π/2) - θ are substituted into the formula cosmAlpha to obtain cosmα=cosm×[(π/2)-θ]≈cosm×[(π/2)-(h/L)]. Thus, the light intensity I at the E1 position shown in FIG. 5 ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+…+I ₀ ×cosm×[(π/2)-(h/L _N )]If N is the number of light emitting units in the lamp area and N can be 4 as shown in FIG. 5, then I ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+I ₀ ×cosm×[(π/2)-(h/L ₃ )]+I ₀ ×cosm×[(π/2)-(h/L _N )]。

The above relation 2: i is ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+…+I ₀ ×cosm×[(π/2)-(h/L _N )]Can also be expressed as

. Wherein the content of the first and second substances,

. Where m is approximately equal to 1. The above relation 2 represents a summation relation of corresponding values of the N light emitting units in the lamp area.

For example, if the pitch of the lamp region 300 is 4.46 mm and the pitch of the light emitting unit 310 is 2.23 mm, S =0.254002. The pitch of the light emitting cells 310 may refer to a side length of an M-polygon.

For example, 0.48. Gtoreq.cosm.times [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.25。

For example, 0.45. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.27。

For example, 0.42. Gtoreq.cosm.times [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.28。

For example, 0.4. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.3。

For example, 0.38. Gtoreq.cosm.times [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.32。

For example, 0.36. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.35。

For example, in the example shown in fig. 6, at least one lamp region 300 includes five light emitting

units

311, 312, 313, 314, and 315, centers of the four light emitting

units

311, 312, 313, and 314 are sequentially connected to form a quadrangle, or the five light emitting

units

311, 312, 313, 314, and 315 are arranged in a quadrangle, and an angle between at least one of the first direction and the second direction and at least one side of the quadrangle is 0 degree.

The four light emitting

units

311, 312, 313 and 314 may be four light emitting units located at the outermost side, or may be four light emitting units located closest to the top corner of the lamp area.

For example, as shown in fig. 6, the lamp region 300 includes 5 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 5, L _i P and N satisfy: 8.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.3。

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.5。

For example, 8.1 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.6。

For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.7。

For example, 8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6。

For example, 7.9 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.9。

For example, 7.8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥7。

For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥6.8。

For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥7.1。

For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥7.2。

For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )≥7.3。

For example, as shown in fig. 6, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.9 to 2.

For example, as shown in fig. 6, five light emitting

units

311, 312, 313, 314, and 315 may be uniformly distributed. For example, the light emitting unit 315 may be located at the center of a quadrangle constituted by the four light emitting

units

311, 312, 313, and 314.

For example, as shown in fig. 6, a quadrangle formed by sequentially connecting the centers of the four light emitting

units

311, 312, 313, and 314 may be rectangular.

For example, a quadrangle formed by sequentially connecting the centers of the four light emitting

units

311, 312, 313, and 314 may be a square.

For example, the included angle between two sides of the quadrangle and the first direction is 0 degree, and the included angle between the other two sides of the quadrangle and the second direction is 0 degree.

For example, as shown in fig. 6, the shape of the lamp area 300 is a first square, a quadrangle formed by sequentially connecting centers of the four light emitting

units

311, 312, 313 and 314 may be a second square, and an angle between a diagonal line of the first square and a diagonal line of the second square is 0 degree. For example, a diagonal of a first square may coincide with a diagonal of a second square.

For example, as shown in fig. 6, the pitch of the lamp regions 300 is 4.46 mm, the pitch of the light emitting units 310 is 2.23 mm, and the size of the light emitting units 310 may be 0.22mm × 0.22mm. For example, the number of the lamp regions 300 may be 2596, e.g., the number of the lamp regions 300 arranged in one of the first and second directions may be 44, and the number of the lamp regions 300 arranged in the other of the first and second directions may be 59. For example, the size of the lamp region 300 provided on the substrate may be 263mm × 196mm.

For example, the parameters of the size of the retaining wall, the material, the size of the light emitting unit, and the like in the example shown in fig. 6 may be the same as those in the above example, and are not described again.

For example, in the example shown in fig. 7, at least one lamp area 300 includes nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319, centers of the four light emitting

units

311, 312, 313, and 314 are sequentially connected to form a quadrangle, or the nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319 are arranged in a quadrangle, and an angle between at least one of the first direction and the second direction and at least one side of the quadrangle is 0 degree. The four light emitting

units

311, 312, 313 and 314 may be four light emitting units located at the outermost side, or four light emitting units located closest to the top corner of the lamp area.

For example, as shown in fig. 7, the lamp region 300 includes 9 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 9, L _i P and N satisfy: 8.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.3。

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.5。

For example, 8.1 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.6。

For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.7。

For example, 8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6。

For example, 7.9. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.9。

For example, 7.8. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥7。

For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.8。

For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥7.1。

For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥7.2。

For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥7.3。

For example, as shown in fig. 7, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.9 to 2.

For example, as shown in fig. 7, nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319 may be uniformly distributed. For example, the light emitting unit 315 may be located at the center of a quadrangle constituted by the four light emitting

units

311, 312, 313, and 314.

For example, as shown in fig. 7, the light emitting unit 318 may be located between the light emitting units 311 and 312, the light emitting unit 319 may be located between the light emitting

units

311 and 314, the light emitting unit 317 may be located between the light emitting units 313 and 314, and the light emitting unit 316 may be located between the light emitting units 312 and 313.

For example, four sides of the quadrangle pass through the centers of the light emitting units 318, 319, 317, and 316, respectively.

For example, the centers of the light emitting units 318, 319, 317, and 316 may be the centers of four sides of a quadrangle, respectively.

For example, as shown in fig. 7, a quadrangle formed by sequentially connecting the centers of the four light emitting

units

311, 312, 313, and 314 may be a rectangle.

units

311, 312, 313, and 314 may be a square.

For example, as shown in fig. 7, the shape of the lamp area 300 is a first square, a quadrangle formed by sequentially connecting centers of the four light emitting

units

For example, as shown in fig. 7, the pitch of the lamp regions 300 is 4.46 mm, the pitch of the light emitting units 310 is 2.23 mm, and the size of the light emitting units 310 may be 0.22mm × 0.22mm. For example, the number of the lamp regions 300 may be 2596, e.g., the number of the lamp regions 300 arranged in one of the first and second directions may be 44, and the number of the lamp regions 300 arranged in the other of the first and second directions may be 59. For example, the size of the lamp region 300 provided on the substrate may be 263mm × 196mm.

For example, the parameters of the size of the retaining wall, the material, the size of the light emitting unit, and the like in the example shown in fig. 7 may be the same as those in the above example, and are not described again.

For example, in the example shown in fig. 8, the at least one lamp area 300 includes seven light emitting

units

311, 312, 313, 314, 315, 316, and 317, centers of the six light emitting

units

311, 312, 313, 314, 316, and 317 are sequentially connected to form a hexagon, or the seven

light emitting units

311, 312, 313, 314, 315, 316, and 317 are arranged in a hexagon, and an included angle between at least one of the first direction and the second direction and at least one side of the hexagon is 0 degree. The six light emitting

units

311, 312, 313, 314, 316, and 317 may be six light emitting units located at the outermost side, or six light emitting units located closest to the top corner of the lamp field.

For example, as shown in fig. 8, the lamp region 300 includes 7 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 7, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.3。

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.5。

For example, 8.1 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.6。

For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.7。

For example, 8. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6。

For example, 7.9 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.9。

For example, 7.8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥7。

For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥6.8。

For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥7.1。

For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥7.2。

For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ )≥7.3。

For example, as shown in fig. 8, the ratio of the pitch of the lamp area 300 to the side length of the hexagon is 1.7 to 2.3. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.65 to 2.25. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.7 to 2.2. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.75 to 2.15. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.8 to 2.1. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.85 to 2.05. For example, the ratio of the pitch of the lamp region 300 to the side length of the hexagon is 1.9 to 2.

For example, as shown in fig. 8, seven light emitting

units

311, 312, 313, 314, 315, 316, and 317 may be uniformly distributed. For example, the light emitting cell 315 may be located at the center of a hexagon composed of six light emitting

cells

311, 312, 313, 314, 316, and 317.

For example, as shown in fig. 8, the hexagon may be a regular hexagon.

For example, as shown in fig. 8, two sides of the hexagon are at an angle of 0 degrees to the first or second direction.

For example, the parameters of the size of the retaining wall, the material, the size of the light emitting unit, and the like in the example shown in fig. 8 may be the same as those in the above example, and are not described again.

Of course, the disclosed embodiments are not limited thereto, and the number of light emitting units in a lamp region may also be six, such as removing the light emitting unit 315 located at the center in fig. 8. The number of the light emitting units in the lamp area can be set according to the requirements of the backlight structure and the requirements of the display panel.

For example, in the example shown in fig. 9, the at least one lamp area 300 includes three light emitting units 311, 312, and 313, centers of the three light emitting units 311, 312, and 313 are sequentially connected to form a triangle, and an included angle between at least one of the first direction and the second direction and at least one side of the triangle is 0 degree. The three light emitting units 311, 312, and 313 may be three light emitting units located at the outermost sides.

For example, as shown in fig. 9, the lamp region 300 includes 3 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 3 _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ )≥6.3。

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 6.5. For example, 8.1 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 6.6. For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 6.7. For example, 8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ ) More than or equal to 6. For example, 7.9 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ ) More than or equal to 6.9. For example, 7.8. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 7. For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 6.8. For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 7.1. For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ ) Not less than 7.2. For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ )≥7.3。

For example, as shown in fig. 9, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp region 300 to the side length of the triangle is 1.9 to 2.

For example, as shown in fig. 9, the three light emitting units 311, 312, and 313 may be uniformly distributed.

For example, as shown in fig. 9, the triangle may be a regular triangle.

For example, as shown in fig. 9, an angle between one side of the triangle and the first direction or the second direction is 0 degree.

Of course, the embodiment of the present disclosure is not limited thereto, and an angle between one side of the triangle and the first direction may be 0 degree, and an angle between the other side of the triangle and the second direction may be 0 degree.

For example, as shown in fig. 9, the pitch of the lamp regions 300 is 4.8 mm, the pitch of the light emitting cells 310 is 2.6 mm, and the size of the light emitting cells 310 may be 0.219mm × 0.219mm.

For example, the parameters of the size of the retaining wall, the material, the size of the light-emitting unit, and the like in the example shown in fig. 9 may be the same as those in the above example, and are not repeated herein.

Fig. 10 is a schematic view of a partial plan structure of a backlight structure provided according to another example of the embodiment of the present disclosure. As shown in fig. 10, the backlight structure includes a substrate 100, a dam pattern 200 disposed on the substrate 100, and a plurality of light emitting units 310. The barrier pattern 200 includes a plurality of openings 210 arranged in an array along a first direction and a second direction, the plurality of openings 210 being configured to define a plurality of lamp regions 300, and a barrier 220 surrounding each of the openings 210, the first direction intersecting the second direction. A plurality of light emitting units 310 and distributed in a plurality of lamp zones 300. The substrate 100 comprises a middle area 101 and an edge area 102 surrounding the middle area 101, at least three light-emitting units 310 are arranged in each lamp area 300 at least located in the middle area 101, the centers of the M light-emitting units 310 closest to the top corner of the lamp area 300 in the at least three light-emitting units 310 are sequentially connected to form an M-polygon, the distance between the center of the M-polygon and the center of the lamp area 300 is less than 10% of the pitch P of the lamp area 300, and the included angles between the first direction and each side of the M-polygon and the included angles between the second direction and each side of the M-polygon are all greater than 0 degree.

For example, one of the first direction and the second direction may be an X direction shown in fig. 10, and the other of the first direction and the second direction may be a Y direction shown in fig. 10, and the embodiment of the present disclosure is schematically described with the first direction being the X direction and the second direction being the Y direction.

For example, the first direction and the second direction are perpendicular. For example, the included angle between the first direction and the second direction may be 80 to 110 degrees, or 85 to 100 degrees, or 88 to 92 degrees. The disclosed embodiments are not limited thereto, and the first direction and the second direction may be interchanged.

For example, as shown in fig. 10, the first and second directions each include an angle greater than 0.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 1 degree with each side of the M-polygon. For example, the first and second directions each include an angle greater than 2 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 3 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 4 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 5.5 degrees with each side of the M-gon. For example, the first and second directions each include an angle greater than 6 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 6.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 7 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 8 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 9 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 10 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 10.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 11 degrees with each side of the M-gon. For example, the first and second directions each include an angle with each side of the M-gon of greater than 12 degrees.

For example, as shown in fig. 10, the angle between the first direction and one side of the M-polygon may be the same as the angle between the second direction and the other side of the M-polygon.

Of course, the embodiment of the present disclosure is not limited thereto, and an included angle between the first direction and one side of the M-polygon may be different from an included angle between the second direction and any one side of the M-polygon.

For example, as shown in fig. 10, a plurality of openings 210 correspond one-to-one to a plurality of lamp zones 300, each opening 210 for defining one lamp zone 300.

For example, the number of light emitting units 310 distributed in different lamp regions 300 may be the same or different.

For example, the number of the light emitting units 310 distributed in a part of the lamp zones 300 in one area on the substrate 100 is the same, and the number of the light emitting units 310 distributed in a part of the lamp zones 300 in another area on the substrate 100 is different, the position arrangement of the one area and the another area may be set according to the product requirements, the one area may be located in the center area of the substrate, and the another area may be an edge area of the substrate; or the one region may be located at an edge region of the substrate and the other region may be located at a central region of the substrate; or both the one region and the other region may be located at different edge regions of the substrate.

For example, as shown in fig. 10, the middle region 101 of the substrate 100 may include at least one lamp zone 300.

For example, the middle region 101 may include two lamp zones 300, four lamp zones 300, or more lamp zones 300.

For example, the edge region 102 includes at least one circle of lamp zones 300 at the edge, and the at least one circle of lamp zones 300 includes two columns of lamp zones 300 respectively located at both sides of the middle region 101 in the first direction and two rows of lamp zones 300 respectively located at both sides of the middle region 101 in the second direction.

For example, as shown in fig. 10, the number of light emitting units 310 provided in each of the lamp zones 300 located in the middle area 101 and the edge area 102 is the same. But is not limited thereto, the number of the lamp regions respectively included in the middle region and the edge region, and the number of the light emitting units included in each of the lamp regions may be set according to product requirements.

For example, as shown in fig. 10, M is not greater than the number of light emitting units 310 provided in each lamp zone 300. For example, the M-polygon may be a triangle, a quadrilateral, a hexagon, etc., which are not limited by the embodiments of the present disclosure.

For example, as shown in fig. 10, at least three light emitting units 310 are disposed in each lamp zone 300 of all the lamp zones 300.

For example, as shown in fig. 10, the shape of the lamp area 300 may be a polygon, such as a triangle, a quadrangle, or a hexagon.

The center of the light-emitting unit refers to the geometric center of the light-emitting unit, for example, the orthographic projection of the geometric center on the substrate coincides with the center of the two-dimensional plane of the orthographic projection of the light-emitting unit on the substrate. The above-mentioned sequential connection of the centers of the M light emitting units may refer to a clockwise or counterclockwise connection of the centers of the M light emitting units.

For example, as shown in fig. 10, the pitch P of the lamp regions 300 may be the length of the center-line of the adjacent lamp regions 300 arranged in the first direction, or the length of the center-line of the adjacent lamp regions 300 arranged in the second direction.

For example, the ratio of the pitch of the lamp regions 300 in the first direction to the pitch of the lamp regions 300 in the second direction may be 0.9 to 1.1, for example, the two pitches may be equal.

For example, as shown in fig. 10, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 9.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 9% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 8.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 8% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 7.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 7% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 6.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 6% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 5.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 4.5% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 4% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 3.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 3% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 2.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 2% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 1.5% of the pitch P of the lamp region 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp area 300 is less than 1% of the pitch P of the lamp area 300. For example, the distance between the center C1 of the M-gon and the center C2 of the lamp region 300 is less than 0.5% of the pitch P of the lamp region 300.

For example, as shown in fig. 10, the center C1 of the M-polygon coincides with the center C2 of the lamp region 300.

In some examples, as shown in fig. 10, the ratio of different side lengths of the M-sided polygon is 0.9 to 1.1, and the ratio of the pitch P of the lamp area 300 to the side length of the M-sided polygon is 1.7 to 2.3.

For example, as shown in FIG. 10, the ratio of the different side lengths of the M-sided polygon is 0.98 to 1.08. For example, the ratio of the different side lengths of the M-sided polygon is 0.96 to 1.04. For example, the ratio of the different side lengths of the M-sided polygon is 0.95 to 1.05. For example, the ratio of the different side lengths of the M-sided polygon is 0.92 to 1.02.

For example, as shown in FIG. 10, the sides of the M-sided polygon are equal, and are all P'.

For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.65 to 2.25. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.7 to 2.2. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.75 to 2.15. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.8 to 2.1. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-polygon is 1.85 to 2.05. For example, the ratio of the pitch P of the lamp region 300 to the side length P' of the M-sided polygon is 1.9 to 2.

For example, as shown in fig. 10, the pitch P of the lamp area 300 is 2 times the side length P' of the M-sided polygon.

For example, the light emitting unit 310 shown in fig. 10 satisfies the lambert cosine law of the cosine emitter shown in fig. 3A to 3B, or a lambertian (j.h. lambert) emitter.

In some examples, the light emitting unit 310 shown in fig. 10 includes the light emitting diode chip 323 shown in fig. 2A and the encapsulation structures 324 configured to encapsulate the light emitting diode chip 323, with a space provided between the encapsulation structures 324 of adjacent light emitting units 310.

For example, the led chip 323 may be a sub-millimeter led chip (miniLED), the size of the unpackaged led chip 323 in a direction perpendicular to the substrate 100 may be 70 to 180 micrometers, and the largest size of the unpackaged led chip 323 in a direction parallel to the substrate 100 is not greater than 500 micrometers.

Since the unpackaged led chip can be regarded as a lambertian illuminant, when the led chip is packaged, the light-emitting angle ranges from + α _1/2 To-alpha _1/2 The internal light can be emitted, and + alpha _1/2 To-alpha _1/2 The external light is substantially confined in the independent device by total reflection, and at this time, an included angle θ between the edge-most light of the light emitted from the light emitting unit 310 and the substrate 100 may be α _1/2 The complementary angle of (c).

For example, as shown in fig. 2A, the light emitting cell 310 or the light emitting diode chip 323 is connected to the pad 321 on the substrate 100 through a solder metal 322.

For example, the solder metal 322 may include solder.

For example, color converting material 325 may include a material that converts blue light into red and green light. Of course, the color conversion material may not be doped in the package structure.

For example, as shown in fig. 2A, a surface of the package structure 324 far from the substrate 100 may be a curved surface, and an angle of light extraction of an edge-most light of the light rays emitted by the light emitting unit 310 is slightly larger than α of the led chip 323 _1/2 If α is _1/2 The value range of (1) is 40 to 65 °, the light-emitting angle of the marginal light ray among the light rays emitted by the light-emitting unit 310 may be 50 to 70 °.

For example, the package structure 324 may have any desired dimension in a direction perpendicular to the substrate 100. For example, the dimension of the encapsulation structure 324 in the direction perpendicular to the substrate 100 may be less than 0.5 mm. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.1 and 0.4 millimeters. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.2 and 0.4 millimeters. For example, the dimension of the package structure 324 in the direction perpendicular to the substrate 100 may be less than 0.3 mm. For example, the dimension of the package structure 324 in the direction perpendicular to the substrate 100 may be between 0.25 mm and 0.35 mm. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be between 0.15 and 0.25 millimeters. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be about 0.2 millimeters. For example, the dimension of the encapsulation structure 324 in a direction perpendicular to the substrate 100 may be about 0.3 millimeters.

For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 2.5 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 2.5 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.3 and 0.7 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be between 0.8 and 0.9 millimeters. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be greater than 0.5 millimeters. For example, the largest dimension of the package structure 324 in a direction parallel to the substrate 100 may be greater than 1.0 millimeter. For example, the largest dimension of the encapsulation structure 324 in a direction parallel to the substrate 100 may be greater than 2.0 millimeters. For example, the largest dimension of the package structure 324 in a direction parallel to the substrate 100 may be less than 2.0 millimeters, and the like.

For example, the maximum dimension of each light emitting unit 310 in the direction perpendicular to the substrate 100 is not more than 2mm.

For example, as shown in fig. 10, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not more than 200 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 180 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 160 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 150 μm. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 140 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 130 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 120 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 110 micrometers. For example, the size of the light emitting cell 310 in a direction perpendicular to the substrate 100 is not greater than 100 micrometers. The size of the light emitting unit 310 in the direction perpendicular to the substrate 100 is the height of the light emitting unit 310.

For example, as shown in fig. 10, the maximum size of the light emitting unit 310 in the direction parallel to the substrate 100 is not more than 3 mm.

In some examples, as shown in fig. 10, the maximum dimension of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 500 micrometers. For example, the maximum dimension of the light emitting unit 310 in a direction parallel to the substrate 100 is not more than 450 micrometers. For example, the maximum dimension of the light emitting unit 310 in a direction parallel to the substrate 100 is not more than 400 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 350 micrometers. For example, the maximum size of the light emitting unit 310 in a direction parallel to the substrate 100 is not greater than 330 micrometers. For example, the maximum dimension of the light emitting unit 310 in a direction parallel to the substrate 100 is not more than 300 micrometers. For example, the maximum size of the light emitting cell 310 in a direction parallel to the substrate 100 is not greater than 280 micrometers.

For example, as shown in fig. 10, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 250 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 240 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 230 micrometers. For example, the size of the light emitting unit 310 in at least one of the first direction and the second direction is not greater than 220 micrometers. For example, the light emitting cells 310 have a size of 219 μm in both the first direction and the second direction.

For example, the shape of the light emitting unit may be a quadrangle, such as a rectangle, and the maximum size of the light emitting unit in a direction parallel to the substrate may be the length of a diagonal line of the quadrangle.

For example, the shape of the light emitting unit may be circular, and the maximum dimension of the light emitting unit in a direction parallel to the substrate may be a diameter.

Of course, the embodiment of the present disclosure is not limited thereto, and the light emitting unit in the example shown in fig. 10 may also include only the unpackaged light emitting diode chip 323 as shown in fig. 2B, where the largest dimension of the unpackaged light emitting diode chip 323 in the direction parallel to the substrate 100 is not greater than 500 micrometers.

In some examples, as shown in fig. 11, the thickness of the retaining wall 220 is greater than the height of the light emitting unit 310 in a direction perpendicular to the substrate 100.

In some examples, as shown in fig. 11, the thickness of the retaining wall 220 is 200 to 400 micrometers, and the height of the light emitting unit 310 is 50 to 100 micrometers. The thickness of the wall 220 refers to the dimension of the wall 220 in the direction perpendicular to the substrate 100.

In some examples, as shown in fig. 11, the thickness of the retaining wall 220 is 250 to 270 micrometers.

For example, the thickness of the retaining wall 220 may be 210 to 390 microns. For example, the thickness of the retaining wall 220 may be 220 to 370 micrometers. For example, the thickness of the retaining wall 220 may be 230 to 350 μm. For example, the thickness of the retaining wall 220 may be 235 to 320 micrometers. For example, the thickness of the retaining wall 220 may be 240 to 300 micrometers. For example, the thickness of the retaining wall 220 may be 245 to 280 micrometers.

In some examples, as shown in fig. 11, the width of the retaining wall 220 is 350 to 500 micrometers. The width of the retaining wall 220 refers to the dimension of the retaining wall 220 between two adjacent lamp regions 300 in the first direction, or the dimension of the retaining wall 220 between two adjacent lamp regions 300 in the second direction.

For example, as shown in FIG. 11, the width of the retaining wall 220 is 370 to 480 micrometers. For example, the width of the retaining wall 220 may be 350 to 450 micrometers. For example, the width of the retaining wall 220 may be 360 to 440 micrometers. For example, the width of the retaining wall 220 may be 370 to 430 micrometers. For example, the width of the retaining wall 220 may be 380 to 420 micrometers. For example, the width of the retaining wall 220 may be 390 to 410 μm. For example, the width of the retaining wall 220 may be 400 μm.

In some examples, as shown in fig. 11, the retaining wall 220 includes a light blocking material. For example, the material of the retaining wall 220 may include black resin.

In some examples, as shown in fig. 10, the light emitting cells 310 provided in each lamp region 300 are electrically connected. For example, the plurality of light emitting cells 310 in each lamp region 300 are connected in series. For example, the plurality of light emitting cells 310 in each lamp region 300 are connected in parallel.

In the backlight structure provided by the disclosure, the light rays among different lamp regions are favorably reduced to generate crosstalk and improve the halo phenomenon by surrounding a circle of shading retaining wall outside each lamp region.

In some examples, as shown in fig. 10, the shape of at least a portion of the lamp region 300 comprises a rectangle in which adjacent sides extend in the first and second directions, respectively.

For example, all of the lamp zones 300 are rectangular in shape. For example, the different lamp zones 300 are the same shape and size.

Of course, the embodiments of the present disclosure are not limited thereto, and the substrate may be divided into a plurality of regions according to product requirements, the sizes of the lamp regions in different regions may be different, and the sizes of the lamp regions in the same region are the same.

Fig. 12 is a schematic view of the light emitting units in one of the lamp zones shown in fig. 10. Fig. 12 schematically illustrates an example in which one lamp region includes four light emitting units, and M-sides are quadrangular.

For example, as shown in fig. 12, one lamp area 300 may be square, and an M-polygon formed by connecting centers of four light emitting units 310 in the lamp area 300 may be square.

For example, as shown in FIG. 12, the light intensity I of the region E1 ₁ The relational expression I can be obtained according to the calculation method shown in FIG. 5 ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) N is the number of light emitting units in the lamp area, and N may be 4 as shown in fig. 12.

In some examples, as shown in fig. 10 and 12, the above relation I ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) In (1) ₀ M, h are regarded as constants, each lamp area 300 of at least part of the lamp areas 300 comprises N light-emitting units 310, N is more than or equal to M, and the distance from the center of the ith light-emitting unit 310 to the top corner of the lamp area 300 is L _i I ranges from 1 to N, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.3. Wherein P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Can be made unitless at the edge positionApproximate reference value of relative light intensity.

For example, 8.3. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.5. For example, 8.1 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.6. For example, 8.2. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.7. For example, 8 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) More than or equal to 6. For example, 7.9 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.9. For example, 7.8 ≧ P × (1/L) ₁ +1/L ₂ +…+1/L _N ) Is more than or equal to 7. For example, 7.7. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 6.8. For example, 7.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 7.1. For example, 7.6. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N ) Not less than 7.2. For example, 7.4. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥7.3。

The top angle of the lamp region may be referred to as the E1 region shown in fig. 12.

For example, as shown in fig. 12, the lamp area 300 includes 4 light emitting units, the distance from the center of the ith light emitting unit 310 to the top corner of the lamp area 300 is Li, the value of i ranges from 1 to 4, li, P and N satisfy: 8.5 is more than or equal to Px (1/L1 +1/L2+1/L3+ 1/L4) is more than or equal to 6.3.

For example, as shown in FIG. 12, taking the pitch of the lamp area 300 as 4.46 mm and the side length of the quadrangle as 2.23 mm as an example, L ₁ Has a value of 1.123379 μm, L ₂ Has a value of 3.363531 μm, L ₃ Has a value of 4.149638 μm, L ₄ Has a value of 2.669986 μm. Substituting the above parameter values into P x (1/L) ₁ +1/L ₂ +…+1/L _N ) P × (1/L) was obtained ₁ +1/L ₂ +…+1/L _N )=8.04。

For example, as shown in fig. 10 and 12, the four light emitting units 310 included in the lamp region 300 form a quadrangle, and an angle between one of the first direction and the second direction and at least one side of the quadrangle is 12 degrees.

For example, as shown in fig. 12, the shape of the lamp area 300 is a first square, the lamp area 300 includes four light emitting units 310, the centers of which are sequentially connected to form a second square, and an angle between a diagonal line of the first square and a diagonal line of the second square is 12 degrees.

This disclosed embodiment rotates so that arbitrary limit of M polygon is not parallel with first direction and second direction through the M polygon that constitutes to luminescence unit in the lamp district to the light intensity of lamp district border region has been improved.

In some examples, as shown in fig. 12, the ratio of the light intensity at the edge position of the lamp area 300, such as the E1 region, to the light intensity at the center position of the lamp area 300 is not less than 0.5.

For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.55. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.6. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.65. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.7. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.75. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.8. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.85. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.9.

For example, as shown in fig. 10 and 12, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.9 to 2.

In some examples, as shown in fig. 10 and 12, the shape of at least a portion of the lamp region 300 comprises a rectangle in which adjacent sides extend in the first and second directions, respectively.

For example, each lamp region 300 is rectangular in shape.

For example, at least a portion of the lamp region 300 is square in shape.

In some examples, as shown in fig. 10, 3A, and 12, the light emitting unit 310 has a light emission intensity distribution I satisfying: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution perpendicular to the normal direction of the light-emitting surface of the light-emitting unit 310, α is the angle between the light-emitting direction of the light-emitting unit 310 and the normal, and m = (-ln 2)/(lncos α) _1/2 )，α _1/2 The light emitting unit 310 emits light with an optical path length h in the normal direction, which is an angle between the normal and the light emitting direction when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction; each lamp area 300 of at least part of the lamp areas 300 comprises N light-emitting units 310, N is more than or equal to M, and the distance from the center of the ith light-emitting unit 310 to the top corner of the lamp area 300 is L _i I ranges from 1 to N, L _i H and N satisfy: 0.5. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.23。

For example, as shown in fig. 10 and 12, when the outgoing light angle θ of the light-emitting unit 310 is small, tan θ ≈ θ = h/L, and tan θ ≈ θ = h/L and α = (pi/2) - θ are substituted into the formula cosmAlpha to obtain cosmα=cosm×[(π/2)-θ]≈cosm×[(π/2)-(h/L)]. Thus, the light intensity I at the E1 position shown in FIG. 12 ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+…+I ₀ ×cosm×[(π/2)-(h/L _N )]If N is the number of light emitting units in the lamp area and N can be 4 as shown in FIG. 12, then I ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+I0×cosm×[(π/2)-(h/L ₃ )]+I ₀ ×cosm×[(π/2)-(h/L _N )]。

The above relation 2: i is ₁ =I ₀ ×cosm×[(π/2)-(h/L ₁ )]+I ₀ ×cosm×[(π/2)-(h/L ₂ )]+…+I ₀ ×cosm×[(π/2)-(h/L _N )]Also can be used forIs shown as I ₁ =I ₀ And x S. Where m is approximately equal to 1.

For example, if the pitch of the lamp area 300 is 4.46 mm and the pitch of the light emitting unit 310 is 2.23 mm, S =0.285151.

For example, 0.48. Gtoreq cosm × [ (π/2) - (h/L1)]+cosm×[(π/2)-(h/L2)]+…+cosm×[(π/2)-(h/L _N )]≥0.25。

For example, 0.42. Gtoreq cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.28。

For example, 0.36. Gtoreq.cosm.times [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]≥0.35。

In another example of the embodiment of the present disclosure, without changing an included angle between a side of the M-polygon shown in fig. 12 and the first direction and the second direction, if the included angle is 12 degrees, only the pitch of the lamp area 300 shown in fig. 12 and the side length of the M-polygon formed by the light emitting units 310 are adjusted, if the pitch of the lamp area 300 is 5.12 millimeters, and the side length of the M-polygon is 2.56 micrometers, then L is adjusted ₁ Has a value of 1.162167. Mu.m, L ₂ Has a value of 4.156017 μm, L ₃ Has a value of 5.113352. Mu.m, L ₄ Has a value of 3.43394 μm.

For example, substituting the above parameter values into P × (1/L) ₁ +1/L ₂ +…+1/L _N ) P × (1/L) was obtained ₁ +1/L ₂ +…+1/L _N )=8.13。

For example, the above-mentioned respective parameter values are substituted into S = cosm × [ (π/2) - (h/L) ₁ )]+cosm×[(π/2)-(h/L ₂ )]+…+cosm×[(π/2)-(h/L _N )]S =0.323765.

The backlight structure provided by the embodiment of the disclosure adjusts the pitch of the lamp area and the size of the side length of the M-shaped polygon while rotating the M-shaped polygon formed by the light emitting units in the lamp area, and is favorable for further improving the light intensity of the edge area of the lamp area.

Fig. 13A to 13G are schematic diagrams of a lamp area according to another example of the embodiment of the present disclosure, and fig. 14 is a relationship diagram of relative light intensities at edge positions of the lamp area after the M-polygon in the lamp area shown in fig. 13A to 13G is rotated by different angles.

The relative light intensity shown in fig. 14 may refer to the value of Q at the edge position of the lamp region, where Q = P × (1/L) ₁ +1/L ₂ +…+1/L _N )。

In the embodiment of the present disclosure, the different angles of rotation of the M-polygon may refer to that the M-polygon is rotated by a certain angle by taking a certain area where the center of the M-polygon is located as a center, for example, the square is rotated by a certain angle by taking a certain area where the center of the square is located as a center.

The rotation can mean that the M-shaped polygon rotates clockwise, and can also mean that the M-shaped polygon rotates anticlockwise.

The difference between the lamp regions shown in fig. 13A to 13G and the lamp regions shown in fig. 12 includes the difference between the side of the M-sided polygon and the angle between the first direction and the second direction.

For example, the angle between the side M1 of the M-polygon M01 shown in fig. 13A and the first direction may be 5 degrees, the angle between the side M1 of the M-polygon M02 shown in fig. 13B and the first direction may be 10 degrees, the angle between the side M1 of the M-polygon M03 shown in fig. 13C and the first direction may be 13 degrees, the angle between the side M1 of the M-polygon M04 shown in fig. 13D and the first direction may be 15 degrees, the angle between the side M1 of the M-polygon M05 shown in fig. 13E and the first direction may be 17 degrees, the angle between the side M1 of the M-polygon M06 shown in fig. 13F and the first direction may be 20 degrees, and the angle between the side M1 of the M07 shown in fig. 13G and the first direction may be 30 degrees.

For example, the angle between the diagonal 392 of the second square M01 and the diagonal 391 of the first square may be 5 degrees as shown in fig. 13A, the angle between the diagonal 392 of the second square M02 and the diagonal 391 of the first square may be 10 degrees as shown in fig. 13B, the angle between the diagonal 392 of the second square M03 and the diagonal 391 of the first square may be 13 degrees as shown in fig. 13C, the angle between the diagonal 392 of the second square M04 and the diagonal 391 of the first square may be 15 degrees as shown in fig. 13D, the angle between the diagonal 392 of the second square M05 and the diagonal 391 of the first square may be 17 degrees as shown in fig. 13E, the angle between the diagonal 392 of the second square M06 and the diagonal 391 of the first square may be 20 degrees as shown in fig. 13F, and the angle between the diagonal 392 of the second square M07 and the diagonal 391 of the first square may be 30 degrees as shown in fig. 13G.

Of course, this disclosed embodiment is not limited to rotate the above-mentioned number of degrees of M polygon, can select the rotatory number of degrees of M polygon according to the product demand.

In some examples, as shown in fig. 13A to 13G and fig. 14, each of the lamp regions 300 of at least some of the lamp regions 300 includes at least four light emitting units 310, the at least four light emitting units 310 are arranged in an M-sided shape, and an included angle between one of the first direction and the second direction and at least one side of the M-sided shape is 12 to 18 degrees.

In some examples, as shown in fig. 13A to 13G and fig. 14, each lamp area 300 of at least some of the lamp areas 300 is shaped as a first square, each lamp area 300 of at least some of the lamp areas 300 includes at least four light emitting units 310, centers of four light emitting units 310 closest to four corners of the lamp area 300 among the at least four light emitting units 310 are sequentially connected to form a second square, and an included angle between a diagonal line of the first square and a diagonal line of the second square is 12 to 18 degrees.

For example, as shown in fig. 13A to 13G and fig. 14, each of at least some of the lamp regions 300 includes four light emitting

units

311, 312, 313 and 314, the four light emitting

units

311, 312, 313 and 314 are arranged in a quadrilateral shape, and an included angle between one of the first direction and the second direction and at least one side of the quadrilateral shape is 12 to 18 degrees.

For example, as shown in fig. 13A to 13G, the lamp area 300 has a first square shape, the centers of the four light emitting units 310 included in the lamp area 300 are sequentially connected to form a second square shape, and an angle between a diagonal line of the first square shape and a diagonal line of the second square shape may be 5 degrees, 10 degrees, 13 degrees, 15 degrees, 17 degrees, 20 degrees, or 30 degrees. Of course, the embodiment of the present disclosure is not limited to the angle between the diagonal line of the first square and the diagonal line of the second square being the above-mentioned degrees, and the angle between the diagonal line of the first square and the diagonal line of the second square may be selected according to the product requirement.

For example, as shown in fig. 13A to 13G, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.9 to 2.

For example, as shown in FIGS. 13A-13G, the light intensity at the edges, e.g., corner regions, of the lamp region 300 satisfies I ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) Wherein, the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i The pitch P of the lamp area 300 and the number N of the light emitting units 310 satisfy: 8.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

For example, as shown in fig. 13A to 13G, Q = P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ )，8.5≥Q≥6.3。

For example, as shown in fig. 13A to 13G, the size of the light emitting unit 310 may be 0.219mm × 0.219mm.

For example, as shown in fig. 13A to 13G and fig. 14, when the pitch of the lamp region 300 is 4.8 mm, the pitch of the light emitting unit 310 is 2.6 mm, the side length of the M-sided polygon is 2.6 mm, and the angle between the side M1 of the second square and the first direction, that is, the angle between the diagonal of the first square and the diagonal of the second square is 0 degree, Q =6.521148; when the included angle between the side M1 of the second square and the first direction is 5 degrees, Q =6.386526; when the included angle between the side M1 of the second square and the first direction is 10 degrees, Q =6.353103; when the included angle between the side M1 of the second square and the first direction is 13 degrees, Q =6.409105; when the included angle between the side M1 of the second square and the first direction is 15 degrees, Q =6.677322; when the angle between the side M1 of the second square and the first direction is 17 degrees, Q =6.325694; when the included angle between the side M1 of the second square and the first direction is 20 degrees, Q =6.161672; q =6.117308 when the side M1 of the second square makes an angle of 30 degrees with the first direction. Therefore, after the M-shaped polygon rotates by different angles, the relative light intensity at the edge position of the lamp area is increased and then reduced along with the increase of the angles.

For example, as shown in fig. 14, in the M-sided polygon, when the rotation angle of the second square is 12 to 18 degrees, the value of the relative light intensity Q at the edge position of the lamp area is large.

According to the backlight structure provided by the embodiment of the disclosure, the angle of the M-shaped polygon formed by arranging the light emitting units in the lamp area is adjusted to a certain range, such as 12 to 18 degrees, and the pitch of the lamp area and the side length of the M-shaped polygon are set, so that the improvement of the light intensity at the edge of the lamp area is facilitated, and the light emitting uniformity of the lamp area is improved.

For example, the angle between the diagonal of the first square and the diagonal of the second square is 13 to 17 degrees. For example, the included angle between the diagonal line of the first square and the diagonal line of the second square is 14.5 to 16.5 degrees. For example, the angle between the diagonal of the first square and the diagonal of the second square is 15 to 16 degrees.

For example, as shown in fig. 13A to 13G, the ratio of the light intensity at the edge position of the lamp region 300, such as the vertex angle region, to the light intensity at the center position of the lamp region 300 is not less than 0.5.

For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.55. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.6. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.65. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.7. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.75. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.8. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.85. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.9.

Fig. 15A to 15G are schematic views of a lamp area provided according to another example of the embodiment of the present disclosure, and fig. 16 is a graph illustrating a relationship between relative light intensities at edge positions of the lamp area after the M-polygon in the lamp area shown in fig. 15A to 15G is rotated by different angles.

For example, the angle between the side M1 of the M-polygon M11 shown in fig. 15A and the first direction may be 5 degrees, the angle between the side M1 of the M-polygon M12 shown in fig. 15B and the first direction may be 10 degrees, the angle between the side M1 of the M-polygon M13 shown in fig. 15C and the first direction may be 13 degrees, the angle between the side M1 of the M-polygon M14 shown in fig. 15D and the first direction may be 15 degrees, the angle between the side M1 of the M-polygon M15 shown in fig. 15E and the first direction may be 17 degrees, the angle between the side M1 of the M-polygon M16 shown in fig. 15F and the first direction may be 20 degrees, and the angle between the side M1 of the M17 shown in fig. 15G and the first direction may be 30 degrees.

For example, the angle between the diagonal 392 of the second square M11 and the diagonal 391 of the first square may be 5 degrees as shown in fig. 15A, the angle between the diagonal 392 of the second square M12 and the diagonal 391 of the first square may be 10 degrees as shown in fig. 15B, the angle between the diagonal 392 of the second square M13 and the diagonal 391 of the first square may be 13 degrees as shown in fig. 15C, the angle between the diagonal 392 of the second square M14 and the diagonal 391 of the first square may be 15 degrees as shown in fig. 15D, the angle between the diagonal 392 of the second square M15 and the diagonal 391 of the first square may be 17 degrees as shown in fig. 15E, the angle between the diagonal 392 of the second square M16 and the diagonal 391 of the first square may be 20 degrees as shown in fig. 15F, and the angle between the diagonal 392 of the second square M17 and the diagonal 391 of the first square may be 30 degrees as shown in fig. 15G.

The relative light intensity shown in fig. 15A to 15G may refer to a value of Q at the edge position of the lamp region, where Q = P × (1/L) ₁ +1/L ₂ +…+1/L _N )。

The different angles of rotation of the M-sided polygon in the embodiment of the present disclosure may refer to that the M-sided polygon is rotated by a certain angle by taking a certain area where the center of the M-sided polygon is located as a center, for example, the square is rotated by a certain angle by taking a certain area where the center of the square is located as a center.

The rotation may refer to clockwise rotation of the M-polygon or counterclockwise rotation of the M-polygon.

The lamp area shown in fig. 15A to 15G differs from the lamp area shown in fig. 13A to 13G in that the lamp area includes a different number of light emitting units, and the lamp area 300 shown in fig. 15A to 15G may include five light emitting units 310, such as Q = P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )。

In some examples, as shown in fig. 15A to 15G and fig. 16, each of at least some of the lamp regions 300 includes at least four light emitting units 310, the at least four light emitting units 310 are arranged in an M-sided shape, and an angle between one of the first direction and the second direction and at least one side of the M-sided shape is 12 to 18 degrees.

In some examples, as shown in fig. 15A to 15G and fig. 16, each lamp area 300 of at least some lamp areas 300 is shaped as a first square, each lamp area 300 of at least some lamp areas 300 includes at least four light emitting units 310, centers of four light emitting units 310 closest to four corners of the lamp area 300 among the at least four light emitting units 310 are sequentially connected to form a second square, and an angle between a diagonal of the first square and a diagonal of the second square is 12 to 18 degrees.

For example, the quadrangles in which the four light emitting cells 310 are arranged as shown in fig. 13A to 13G and the quadrangles in which the five light emitting cells 310 are arranged as shown in fig. 15A to 15G may all have the same shape and size, but are not limited thereto, and at least one of the two parameters of the shape and size of the two may be different.

In some examples, as shown in fig. 15A to 15G, the at least four light emitting cells 310 include five light emitting cells 310, and centers of four light emitting cells 310 located at the outermost edges among the five light emitting cells 310 are sequentially wired to form a second square.

For example, as shown in fig. 15A to 15G, each of the at least some lamp zones 300 includes five light emitting

units

311, 312, 313, 314, and 315, the five light emitting

units

311, 312, 313, 314, and 315 are arranged in a quadrangle, and an included angle between one of the first direction and the second direction and at least one side of the quadrangle is 12 to 18 degrees.

For example, as shown in fig. 15A to 15G, four light emitting

units

311, 312, 313, and 314 are arranged in a quadrangle, and a light emitting unit 315 is located at the center of the four light emitting

units

311, 312, 313, and 314.

For example, as shown in fig. 15A to 15G and 16, the lamp area 300 has a first square shape, centers of four outermost light emitting cells 310 among five light emitting cells 310 included in the lamp area 300 are sequentially connected to form a second square shape, and an angle between a diagonal line of the first square shape and a diagonal line of the second square shape may be 5 degrees, 10 degrees, 13 degrees, 15 degrees, 17 degrees, 20 degrees, or 30 degrees. Of course, the embodiment of the present disclosure is not limited to the angle between the diagonal line of the first square and the diagonal line of the second square being the above-mentioned degrees, and the angle between the diagonal line of the first square and the diagonal line of the second square can be selected according to product requirements.

For example, as shown in fig. 15A to 15G, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the second square is 1.9 to 2.

For example, as shown in fig. 15A to 15G, the sides of the lamp zone 300The intensity of the edge, e.g. corner region, satisfies I ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) Wherein the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i The pitch P of the lamp area 300 and the number N of the light emitting units 310 satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

For example, as shown in fig. 15A to 15G, Q = P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ )，8.5≥Q≥6.3。

For example, as shown in fig. 15A to 15G, the size of the light emitting unit 310 may be 0.219mm × 0.219mm.

For example, as shown in fig. 15A to 15G and fig. 16, when the pitch of the lamp region 300 is 4.8 mm, the pitch of the light emitting unit 310 is 2.6 mm, the side length of the M-sided polygon is 2.6 mm, and the angle between the side M1 of the second square and the first direction, that is, the angle between the diagonal of the first square and the diagonal of the second square is 0 degree, Q =7.935362; when the included angle between the side M1 of the second square and the first direction is 5 degrees, Q =7.80074; when the included angle between the side M1 of the second square and the first direction is 10 degrees, Q =7.767317; when the included angle between the side M1 of the second square and the first direction is 13 degrees, Q =7.823319; when the included angle between the side M1 of the second square and the first direction is 15 degrees, Q =8.091537; when the included angle between the side M1 of the second square and the first direction is 17 degrees, Q =7.739908; when the included angle between the side M1 of the second square and the first direction is 20 degrees, Q =7.575887; when the angle between the side M1 of the second square and the first direction is 30 degrees, Q =7.531522. Therefore, after the M-shaped polygon rotates by different angles, the relative light intensity at the edge position of the lamp area is increased and then reduced along with the increase of the angles.

For example, as shown in fig. 16, in the M-sided polygon, when the rotation angle of the second square is 12 to 18 degrees, the value of the relative light intensity Q at the edge position of the lamp area is large.

The backlight structure provided by the embodiment of the disclosure adjusts the angle of the M-sided polygon formed by arranging the light emitting units in the lamp area to a certain range, such as 12 to 18 degrees, and sets the number of the light emitting units in the lamp area, the lamp area pitch and the side length of the M-sided polygon, thereby being beneficial to improving the light intensity at the edge of the lamp area and improving the light emitting uniformity of the lamp area.

For example, as shown in fig. 14 and 16, when the number of light emitting units 310 provided in the lamp region 300 is five, the light intensity at the edge position of the lamp region 300, e.g., at the top corner position, is greater than the light intensity at the edge position of the lamp region 300 when the number of light emitting units 310 in the lamp region 300 is four.

For example, the included angle between the diagonal line of the first square and the diagonal line of the second square is 13 to 17 degrees. For example, the included angle between the diagonal line of the first square and the diagonal line of the second square is 14.5 to 16.5 degrees. For example, the angle between the diagonal of the first square and the diagonal of the second square is 15 to 16 degrees.

For example, as shown in fig. 15A to 15G, the ratio of the light intensity at the edge position of the lamp region 300, such as the vertex angle region, to the light intensity at the center position of the lamp region 300 is not less than 0.5.

For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.55. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.6. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.65. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.7. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.75. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.8. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.85. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.9.

For example, the parameters of the size, material, etc. of the retaining wall in the example shown in fig. 15A to 15G may be the same as those in the above example, and are not repeated herein.

Fig. 17A to 17G are schematic views of a lamp area provided according to another example of the embodiment of the present disclosure, and fig. 18 is a graph illustrating a relationship between relative light intensities at edge positions of the lamp area after the M-polygon in the lamp area shown in fig. 17A to 17G is rotated by different angles.

For example, the angle between the side M2 of the triangle M21 shown in fig. 17A and the first direction may be 5 degrees, the angle between the side M2 of the triangle M22 shown in fig. 17B and the first direction may be 10 degrees, the angle between the side M2 of the triangle M23 shown in fig. 17C and the first direction may be 13 degrees, the angle between the side M2 of the triangle M24 shown in fig. 17D and the first direction may be 15 degrees, the angle between the side M2 of the triangle M25 shown in fig. 17E and the first direction may be 17 degrees, the angle between the side M2 of the triangle M26 shown in fig. 17F and the first direction may be 20 degrees, and the angle between the side M2 of the triangle M27 shown in fig. 17G and the first direction may be 30 degrees. Of course, the included angle between the triangle side and the first direction is not limited to the above degrees in the embodiments of the present disclosure, and the included angle between the triangle side and the first direction may be selected according to product requirements.

The relative light intensities shown in fig. 17A to 17G may refer to the value of Q at the edge position of the lamp region, where Q = P × (1/L) ₁ +1/L ₂ +…+1/L _N )。

The different angles of rotation of the M-sided polygon in the embodiment of the present disclosure may refer to that the M-sided polygon is rotated by a certain angle by taking a certain area where the center of the M-sided polygon is located as a center, and if the M-sided polygon is rotated by a certain angle by taking a certain area where the center of the triangle is located as a center, the triangle is rotated by a certain angle.

The differences between the lamp regions shown in fig. 17A to 17G and the lamp regions shown in fig. 13A to 13G and fig. 15A to 15G include the shape of the M-polygon, which may be triangular as shown in fig. 17A to 17G.

In some examples, as shown in fig. 17A to 17G, each lamp zone 300 of at least some of the lamp zones 300 includes three light emitting units 311, 312, and 313, centers of the three light emitting units 311, 312, and 313 are sequentially connected to form a triangle, and an angle between one of the first direction and the second direction and one side M2 of the triangle is less than 5 degrees.

For example, as shown in fig. 17A to 17G, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp region 300 to the side length of the triangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the triangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp region 300 to the side length of the triangle is 1.9 to 2.

For example, as shown in FIGS. 17A to 17G, the light intensity at the edge of the lamp region 300, e.g., the corner region, satisfies I ₁ =I ₀ ×m×h×(1/L ₁ +1/L ₂ +…+1/L _N ) Wherein the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i The pitch P of the lamp area 300 and the number N of the light emitting units 310 satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

For example, as shown in fig. 17A to 17G, Q = P × (1/L) ₁ +1/L ₂ +1/L ₃ )，8.5≥Q≥6.3。

For example, as shown in fig. 17A to 17G, the size of the light emitting unit 310 may be 0.219mm × 0.219mm.

For example, as shown in fig. 17A to 17G and fig. 18, when the pitch of the lamp region 300 is 4.8 mm, the pitch of the light emitting unit 310 is 2.6 mm, the side length of the M-polygon is 2.6 mm, and the included angle between the side M2 of the triangle and the first direction is 0 degree, Q =3.926995; when the included angle between the side M2 of the triangle and the first direction is 5 degrees, Q =3.880136; when the included angle between the side M2 of the triangle and the first direction is 10 degrees, Q =3.840027; when the included angle between the side M2 of the triangle and the first direction is 13 degrees, Q =3.82151; when the included angle between the side M2 of the triangle and the first direction is 15 degrees, Q =3.811524; q =3.803458 when the angle between the side M2 of the triangle and the first direction is 17 degrees; when the included angle between the side M2 of the triangle and the first direction is 20 degrees, Q =3.794941; q =3.797286 when the angle between the side M2 of the triangle and the first direction is 30 degrees. Therefore, after the M-shaped polygon rotates by different angles, the relative light intensity at the edge position of the lamp area is gradually reduced along with the increase of the angles.

The included angle between one of the first direction and the second direction and one side M2 of the triangle is smaller, so that the light intensity at the edge position of the lamp area is improved, and the light emitting uniformity of the lamp area is improved.

For example, as shown in fig. 17A to 17G, the angle between the first direction or the second direction and one side M2 of the triangle is less than 4.5 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 4 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 3.5 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 3 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 2.5 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 2 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 1.5 degrees. For example, the angle between the first direction or the second direction and one side M2 of the triangle is less than 1 degree. For example, the angle between the first or second direction and one side M2 of the triangle is less than 0.5 degrees.

For example, as shown in fig. 17A to 17G, the ratio of the light intensity at the edge position of the lamp region 300, such as the vertex angle region, to the light intensity at the center position of the lamp region 300 is not less than 0.5.

For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.55. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.6. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.65. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.7. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.75. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.8. For example, the ratio of the light intensity at the edge position of the lamp region 300 to the light intensity at the center position of the lamp region 300 is not less than 0.85. For example, the ratio of the light intensity at the edge position of the lamp area 300 to the light intensity at the center position of the lamp area 300 is not less than 0.9.

For example, the parameters of the size, material, etc. of the retaining wall in the example shown in fig. 17A to 17G may be the same as those in the above example, and are not described again.

For example, in the example shown in fig. 19, at least one lamp area 300 includes nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319, wherein centers of four light emitting

units

311, 312, 313, and 314 are sequentially connected to form a quadrangle, or nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319 are arranged in a quadrangle, and an angle between at least one of the first direction and the second direction and at least one side of the quadrangle is greater than 0 degree.

The four light emitting

units

For example, as shown in fig. 19, the first and second directions each include an angle greater than 0.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 1 degree with each side of the M-polygon. For example, the first and second directions each include an angle greater than 2 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 3 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 4 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 5.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 6 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 6.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 7 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 8 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 9 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 10 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 10.5 degrees with each side of the M-polygon. For example, the first and second directions each include an angle greater than 11 degrees with each side of the M-polygon. For example, the first and second directions each include an angle with each side of the M-gon of greater than 12 degrees.

For example, as shown in fig. 19, the angle between the side M1 of the M-sided polygon and the first direction is 12 to 18 degrees. For example, the included angle between the side M1 of the M-shaped polygon and the first direction is 12.5 to 17.5 degrees. For example, the included angle between the side M1 of the M-sided polygon and the first direction is 13 to 17 degrees. For example, the included angle between the side M1 of the M-shaped polygon and the first direction is 13.5 to 16.5 degrees. For example, the included angle between the side M1 of the M-polygon and the first direction is 14 to 16 degrees. For example, the included angle between the side M1 of the M-shaped polygon and the first direction is 14.5 to 15 degrees.

For example, as shown in fig. 19, the lamp region 300 includes 9 light emitting units, and the distance from the center of the ith light emitting unit 310 to the top corner of the lamp region 300 is L _i I ranges from 1 to 9, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.3。

For example, 8.1. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.6。

For example, 8. Gtoreq.Px (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6。

For example, 7.9 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥6.9。

For example, 7.8 ≧ P × (1/L) ₁ +1/L ₂ +1/L ₃ +1/L ₄ +1/L ₅ +1/L ₆ +1/L ₇ +1/L ₈ +1/L ₉ )≥7。

For example, as shown in fig. 19, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.3. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.65 to 2.25. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.7 to 2.2. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.75 to 2.15. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.8 to 2.1. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.85 to 2.05. For example, the ratio of the pitch of the lamp area 300 to the side length of the quadrangle is 1.9 to 2.

For example, as shown in fig. 19, nine light emitting

units

311, 312, 313, 314, 315, 316, 317, 318, and 319 may be uniformly distributed.

For example, the light emitting unit 315 may be located at the center of a quadrangle constituted by the four light emitting

units

311, 312, 313, and 314.

For example, as shown in fig. 19, the light emitting unit 318 may be located between the light emitting

units

311 and 314, the light emitting unit 319 may be located between the light emitting units 313 and 314, the light emitting unit 317 may be located between the light emitting units 313 and 312, and the light emitting unit 316 may be located between the light emitting units 312 and 311.

For example, as shown in fig. 19, a quadrangle formed by sequentially connecting the centers of the four light emitting

units

311, 312, 313, and 314 may be a rectangle.

units

311, 312, 313, and 314 may be a square.

For example, the angle between two sides of the quadrangle and the first direction is greater than 0 degree, and the angle between the other two sides of the quadrangle and the second direction is greater than 0 degree.

units

311, 312, 313 and 314 may be a second square, and an angle between a diagonal line of the first square and a diagonal line of the second square is greater than 0 degree.

For example, as shown in fig. 19, the ratio of the light intensity at the edge position of the lamp region 300, such as the vertex angle region, to the light intensity at the center position of the lamp region 300 is not less than 0.5.

For example, the parameters of the size of the dam, the material, and the size of the light emitting unit in the example shown in fig. 19 may be the same as those in the above example, and are not repeated herein.

The embodiments of the present disclosure are not limited to the shape of the lamp region being rectangular as shown in fig. 1 to 19, for example, the shape of the lamp region may be designed according to the requirement of the display panel corresponding to the backlight structure, and for example, the shape of the lamp region may also be hexagonal or octagonal.

The number of the light emitting units in the lamp area is not limited to three, four, five, seven, nine as shown in fig. 1 to 19, and may be set according to the position and size of the light emitting units, for example, the number of the light emitting units in the lamp area may also be six, eight, ten, eleven, twelve, and the like.

The backlight structure that this disclosed embodiment provided coordinates the setting through the quantity to luminescence unit in the lamp district, the length of side of M limit, the pitch in lamp district, the limit of M limit and contained angle between first direction or the second direction, is favorable to improving the light intensity at lamp district edge, and then improves the light-emitting homogeneity in lamp district.

Fig. 20 is a schematic partial cross-sectional view taken along line AA' shown in fig. 1, provided in accordance with another example of an embodiment of the present disclosure. Fig. 21 is a schematic partial cross-sectional view taken along line BB' of fig. 10 provided in accordance with another example of an embodiment of the present disclosure.

In some examples, as shown in fig. 20 and 21, the backlight structure further includes a flat adhesive 400 between the retaining wall 220 and the light emitting unit 310, and between two adjacent light emitting units 310. The thickness of the flat glue 400 is not less than the height of the light emitting unit 310 and less than the thickness of the retaining wall 220, and the orthographic projection of the side surface of the flat glue 400 close to the substrate 100 on the substrate 100 is completely located in the orthographic projection of the side surface of the flat glue 400 far away from the substrate 100 on the substrate 100.

For example, as shown in fig. 20 and 21, the flat glue 400 may fill at least a portion of a gap between the retaining wall 220 and the light emitting unit 310 and at least a portion of a gap between adjacent light emitting units 310.

For example, as shown in fig. 20 and 21, the thickness of the flat glue 400 may be greater than the height of the light emitting unit 310, or may be equal to the height of the light emitting unit 310.

For example, as shown in fig. 20 and 21, white oil may be used for the glue 400. For example, the thickness of the flat gel 400 may be 50 microns. For example, the thickness of the flat glue 400 may be greater than 90 microns. For example, the thickness of the flat glue 400 may be less than 250 microns. For example, the thickness of the flat glue 400 may be less than 200 microns. For example, the thickness of the flat glue 400 may be less than 180 microns. For example, the thickness of the flat glue 400 may be less than 150 microns. For example, the thickness of the flat glue 400 may be less than 120 microns. For example, the thickness of the flat glue 400 may be less than 100 microns.

In some examples, as shown in fig. 20 and 21, a cross-sectional shape of the flat glue 400 cut by a plane (e.g., an XZ plane) where center connecting lines of two adjacent light emitting units 310 are located includes a trapezoid, a length of a first base 410 of the trapezoid away from the substrate 100 is greater than a length of a second base 420 of the trapezoid close to the substrate 100, a distance between end points of orthographic projections of the first base 410 and the second base 420 on the substrate 100, which are close to each other, is 17 to 32 micrometers, and the plane where the center connecting lines of the two adjacent light emitting units 310 are located is perpendicular to the substrate 100.

For example, as shown in fig. 20 and 21, a center line between the first bottom edge 410 and the second bottom edge 420 is perpendicular to the substrate 100. For example, the length difference between the first base 410 and the second base 420 at the side of the trapezoid perpendicular to the center line of the substrate 100 may be 17 to 32 micrometers.

For example, the difference between the thicknesses of the flat glue 400 at different positions may be 10% or less of the position where the thickness of the flat glue 400 is the largest. For example, the difference in the thickness of the glue 400 at different positions may be 8% or less of the maximum thickness of the glue 400.

For example, the thickness of the flat glue 400 is 49.79 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on one side of the trapezoid perpendicular to the center line of the substrate 100 may be 28.93 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on the other side of the trapezoid perpendicular to the center line of the substrate 100 may be 30.9 micrometers.

For example, the thickness of the glue 400 is 47.29 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on one side of the trapezoid perpendicular to the center line of the substrate 100 may be 26.3 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on the other side of the trapezoid perpendicular to the center line of the substrate 100 may be 29.59 micrometers.

For example, the thickness of the glue 400 is 51.28 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on one side of the trapezoid perpendicular to the center line of the substrate 100 may be 18.41 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on the other side of the trapezoid perpendicular to the center line of the substrate 100 may be 26.96 micrometers.

For example, the thickness of the glue 400 is 51.94 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on one side of the trapezoid perpendicular to the center line of the substrate 100 may be 26.3 micrometers, and the difference between the lengths of the first base 410 and the second base 420 on the other side of the trapezoid perpendicular to the center line of the substrate 100 may be 27.61 micrometers.

In the backlight structure provided by the present disclosure, the cross section of the glue flattening is set to be trapezoidal, for example, an undercut structure is formed, so that the glue flattening can be prevented from eroding a bonding pad (for example, the bonding pad 321 shown in fig. 2A) electrically connected with the light emitting unit after being heated and extended, and meanwhile, the light emitting characteristic change caused by the different refractive indexes due to the outgoing of the light emitted by the light emitting unit after passing through the glue flattening can also be prevented.

In some examples, as shown in fig. 22, a side of the substrate 100 away from the light emitting unit 310 is provided with a thermal conductive paste 500, and at least one opening 501 is provided in the thermal conductive paste 500.

For example, as shown in fig. 22, black thermal conductive paste with a thickness less than 1 μm is attached to the entire surface of the substrate 100 away from the light emitting unit 310 to achieve a heat dissipation effect.

For example, as shown in fig. 22, the aperture of the opening 502 may be 1.5 mm. For example, the number of openings 502 may be greater than 100, such as 29 x 18. Through set up the trompil in the heat-conducting glue, be favorable to playing the exhaust effect when attached heat-conducting glue on the base plate, prevent the heat-conducting glue fold.

For example, a ground wire, such as a copper wire, may also be disposed on the side of the substrate 100 away from the light emitting unit 310. For example, the copper wire may have a length of 0.45 mm.

For example, a flat glue with a thickness of 0.3 μm may be further disposed on a side of the substrate 100 facing the light emitting unit 310, for example, a white dam glue may be disposed on the periphery of each lamp area, for example, the width of the white dam glue may be 0.5 mm, and the height of the white dam glue may be 0.25 mm, so as to achieve the effects of increasing the brightness and improving the halo.

Fig. 23 is a partial cross-sectional view of a backlight structure including the substrate, the dam, and the light-emitting unit shown in fig. 11.

In some examples, as shown in fig. 23, the backlight structure further includes a light diffusion structure 610 on a side of the light emitting unit 310 away from the substrate 100. The light diffusion structure 610 includes at least one diffusion film, for example, the light diffusion structure 610 includes three diffusion films 611, 612, and 613, and the thickness of each diffusion film is 0.05 to 0.2 mm.

For example, the thickness of the different diffusion films may be the same or different.

For example, as shown in fig. 23, the thickness of the diffusion film 611 is 0.12 mm, the thickness of the diffusion film 612 is 0.13 mm, and the thickness of the diffusion film 613 is 0.13 mm. For example, the thickness of the diffusion film 611 is 0.085 mm, the thickness of the diffusion film 612 is 0.19 mm, and the thickness of the diffusion film 613 is 0.14 mm. For example, the three diffusion films 611, 612, and 613 may each have a thickness of 0.19 mm. For example, the diffusion membrane may weigh 14.7 grams. For example, the weight of the diffusion film 611 is 10.25 grams, the weight of the diffusion film 612 is 14.31 grams, and the weight of the diffusion film 613 is 20.5 grams.

In some examples, as shown in fig. 23, the backlight structure further includes a color conversion structure 620 located at a side of the light diffusion structure 610 away from the light emitting unit 310. The color conversion structure 620 includes a color conversion film 622 configured to convert first color light including blue light into second color light including at least one of red light and green light. For example, the color conversion film converts blue light into red light. For example, the color conversion film converts blue light into green light.

In some examples, as shown in fig. 23, the color conversion structure 620 further includes a prism 623 located on a side of the color conversion film 622 away from the light emitting unit 310.

For example, the total thickness of the prism 623 may be 0.2 mm, and the prism 623 may include a plurality of sub-prisms, each of which may have a length of 39 microns, a width of 39 microns, and a height of 17 microns.

For example, a ratio of the pitch of the sub-prisms to the pitch of the light emitting cells is greater than 100 and less than 150.

For example, as shown in fig. 23, the color conversion structure 620 further includes a phosphor composite film 621 on a side of the color conversion film 622 adjacent to the substrate 100.

For example, as shown in fig. 23, the thickness of the color conversion structure 620 may be 0.2 to 0.4 mm. For example, the thickness of the color conversion structure 620 may be 0.21 mm. For example, the thickness of the color conversion structure 620 may be 0.27 mm. For example, the thickness of the color conversion structure 620 may be 0.308 millimeters. For example, the color converting structure 620 may have a thickness of 27 grams. For example, the color converting structure 620 may have a thickness of 30.78 grams.

In some examples, as shown in fig. 23, the backlight structure further includes a prism structure 630 located on a side of the color conversion structure 620 away from the light emitting unit 310. The prism structure 630 includes at least one prism layer, and the thickness of the prism layer is 0.05 to 0.2 mm.

For example, as shown in fig. 23, the prism structure 630 includes a prism layer 631 and a prism layer 632. For example, the prism layers 631 and 632 may have the same thickness or different thicknesses.

For example, as shown in fig. 23, the thickness of the prism layer 631 may be 0.1 mm, and the thickness of the prism layer 632 may be 0.11 mm. For example, the thickness of the prism layer 631 may be 0.09 mm, and the thickness of the prism layer 632 may be 0.24 mm.

For example, the prismatic structure 630 may also include only one prism layer, which may be 0.16 mm thick.

For example, the backlight structure may further include a diffuser plate (not shown) on a side of the prism structure 630 remote from the substrate 100.

Fig. 24 is a schematic partial cross-sectional structure view of a display device according to another embodiment of the present disclosure. As shown in fig. 24, the display device includes a display panel 1000 and a backlight structure 2000, wherein the display panel 1000 is located at a light emitting side of the backlight structure 2000.

The backlight structure in the display device provided by the present disclosure can be any one of the backlight structures provided by the above embodiments, and the number of the light emitting units in the lamp area of the backlight structure, the side length of the M-polygon, the pitch of the lamp area, and the included angle between the side of the M-polygon and the first direction or the second direction are coordinately set, so that the light intensity at the edge of the lamp area is favorably improved, and further the light emitting uniformity of the lamp area is improved.

For example, as shown in fig. 24, the backlight structure 2000 further includes a diffusion plate 650 positioned at a side of the prism structure 630 away from the substrate 100. For example, the diffuser plate 650 may have a thickness of 0.24 mm. For example, the diffuser plate 650 may weigh 15.2 grams.

For example, as shown in fig. 24, the display panel 1000 is a liquid crystal display panel. The liquid crystal display panel may include an array substrate 1003, an opposite substrate 1002, and a liquid crystal layer (not shown) between the array substrate 1003 and the opposite substrate 1002.

For example, one side of the array substrate 1003 facing the opposite substrate 1002 may include a plurality of gate lines extending along one direction and a plurality of data lines extending along another direction, the plurality of gate lines and the plurality of data lines are arranged in a crossing manner to define a plurality of pixel units arranged in an array, and the plurality of pixel units may be arranged in a pixel array. Each pixel unit may include a pixel electrode and a thin film transistor, the gate line is connected to a gate electrode of the thin film transistor to control the thin film transistor to be turned on or turned off, the pixel electrode is connected to one of source and drain electrodes of the thin film transistor, the data line is connected to the other of the source and drain electrodes of the thin film transistor, and the data line inputs a voltage signal required for displaying a picture to the pixel electrode through the thin film transistor to realize display of the array substrate.

For example, the opposite substrate 1002 may be a color filter substrate, and a color filter layer corresponding to the pixel units and a black matrix covering the gate lines, the data lines, and the like in the non-display region may be disposed on one side of the color filter substrate facing the array substrate 1003. For example, a common electrode disposed opposite to the pixel electrode may be disposed on a side of the color filter substrate facing the array substrate 1003, and the common electrode is configured to apply a common voltage to generate an electric field with the pixel electrode for driving liquid crystal molecules in the liquid crystal layer to deflect. The liquid crystal molecules are deflected to change the transmittance of the liquid crystal layer, thereby realizing display of a desired gray-scale image.

For example, as shown in fig. 24, the display panel 1000 may further include a first polarizer 1004 disposed on a side of the array substrate 1003 remote from the opposite substrate 1002 and a second polarizer 1001 disposed on a side of the opposite substrate 1002 remote from the array substrate 1003. The first polarizer 1004 includes a transmission axis extending in the DI1 direction and polarizes the backlight incident thereto in the DI1 direction. The second polarizer 1001 includes a transmission axis extending in the DI2 direction and polarizes light incident to the second polarizer in the DI2 direction. For example, the transmission axis of the first polarizer 1004 and the transmission axis of the second polarizer 1001 are perpendicular to each other.

For example, as shown in fig. 24, the display device further includes a glue frame 3002, and the glue frame 3002 is used to support the display panel 1000.

For example, as shown in fig. 24, the display device further includes a support frame 3001, and the support frame 3001 includes an integrated structure of an outer frame and a back frame. The supporting frame is used for supporting the rubber frame 3002 and the backlight structure 2000.

For example, as shown in fig. 24, the display device further includes a fixing adhesive 640 located at a side of the heat conductive adhesive 500 away from the lamp panel 123 including the structures such as the substrate, the light emitting unit, and the retaining wall pattern, and the fixing adhesive 640 is used for fixing the backlight structure 2000 on the supporting frame 3001.

For example, as shown in fig. 24, the thickness of the second polarizer 1001 may be 0.28 mm. For example, the thickness of the opposite substrate 1002 may be 0.25 mm. For example, the thickness of the array substrate 1003 may be 0.25 mm. For example, the thickness of the first polarizer 1004 may be 0.11 mm. For example, the sum of the weights of the second polarizer 1001, the opposite substrate 1002, the array substrate 1003, and the first polarizer 1004 may be 159.3 g.

For example, as shown in fig. 24, the thickness of the second polarizer 1001 may be 0.122 mm. For example, the thickness of the opposite substrate 1002 may be 0.2 mm. For example, the thickness of the array substrate 1003 may be 0.2 mm. For example, the thickness of the first polarizer 1004 may be 0.087 mm. For example, the total weight of the second polarizer 1001, the opposite substrate 1002, the array substrate 1003, and the first polarizer 1004 may be 105.47 g.

For example, as shown in fig. 24, the thickness of the lamp panel 123 may be 0.27 mm, and lamp panel protection glue is further disposed between the lamp panel 123 and the heat conduction glue 500, for example, the thickness of the lamp panel protection glue may be 0.31 mm, the thickness of the heat conduction glue 500 may be 0.09 mm, and the total weight of the lamp panel, the lamp panel protection glue, and the heat conduction glue may be 76.6 g.

For example, as shown in fig. 24, the thickness of the lamp panel 123 may be 0.25 mm, and one side of the lamp panel 123 away from the light diffusion structure 610 may only be provided with lamp panel protection glue, and no longer be provided with heat conduction glue, and if the thickness of the lamp panel protection glue may be 0.1 mm, the total weight of the lamp panel and the lamp panel protection glue may be 41.41 g.

For example, as shown in fig. 24, when the thermal conductive paste 500 is provided, the thickness of the fixing paste 640 may be 0.03 mm. For example, when the thermal conductive paste 500 is not provided, the thickness of the fixing paste 640 may be 0.1 mm.

The following points need to be explained:

(1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the same embodiment of the disclosure and of different embodiments may be combined with each other without conflict.

The above description is intended to be exemplary of the present disclosure, and not to limit the scope of the present disclosure, which is defined by the claims appended hereto.

Claims

1. A backlight structure, comprising:

a substrate;

a dam pattern on the substrate and including a plurality of openings arrayed in a first direction and a second direction, the plurality of openings being configured to define a plurality of lamp regions, and a dam surrounding each of the openings, the first direction intersecting the second direction;

a plurality of light emitting units disposed on the substrate and distributed in the plurality of lamp regions,

the substrate comprises a middle area and an edge area surrounding the middle area, at least three light-emitting units are arranged in each lamp area at least located in the middle area, the centers of M light-emitting units closest to the top angle of each lamp area in the at least three light-emitting units are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of each lamp area is smaller than 10% of the pitch of each lamp area, and included angles between the first direction and each side of the M-shaped polygon and included angles between the second direction and each side of the M-shaped polygon are larger than 0 degree.

2. The backlight structure according to claim 1, wherein the ratio of different side lengths of the M-shaped polygon is 0.9 to 1.1, and the ratio of the pitch of the lamp area to the side length of the M-shaped polygon is 1.7 to 2.3.

3. The backlight structure according to claim 2, wherein the pitch of the lamp regions is P, each of the at least some lamp regions comprises N light emitting units, N ≧ M, and a distance from a center of an ith light emitting unit to a top corner of the lamp region is L _i I ranges from 1 to N, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

4. The backlight structure according to claim 2, wherein the luminous intensity distribution I of the light emitting unit satisfies: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution in the normal direction perpendicular to the light-emitting surface of the luminous unit, alpha is the included angle between the luminous direction of the luminous unit and the normal, and m = (-ln 2)/(lncos alpha) _1/2 )，α _1/2 The included angle between the light emitting direction and the normal is formed when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction, and the optical path of the light emitted by the light emitting unit in the normal direction is h;

each lamp zone of at least part of the lamp zones comprises N light-emitting units, N is more than or equal to M, and the distance from the center of the ith light-emitting unit to the top angle of the lamp zone is L _i I ranges from 1 to N, L _i H and N satisfy:

5. the backlight structure according to claim 2, wherein a ratio of light intensity at an edge position of the lamp region to light intensity at a center position of the lamp region is not less than 0.5.

6. The backlight structure according to claim 2, wherein each of the at least some lamp regions comprises at least four light emitting units, the at least four light emitting units are arranged in the M-polygon, and an included angle between one of the first direction and the second direction and at least one side of the M-polygon is 12 to 18 degrees.

7. The backlight structure of claim 6, wherein each of the at least some lamp areas is shaped as a first square, each of the at least some lamp areas comprises at least four light emitting units, the M-edge is a second square, and an included angle between a diagonal of the first square and a diagonal of the second square is 12 to 18 degrees.

8. The backlight structures defined in claim 1 wherein the shape of at least some of the lamp regions comprises a rectangle having two adjacent sides extending in the first and second directions, respectively.

9. The backlight structure according to claim 1, wherein the light emitting cells disposed in each lamp region are electrically connected, and the dam comprises a light blocking material.

10. The backlight structure defined in claim 1 wherein the light-emitting units comprise light-emitting diode chips and encapsulation structures configured to encapsulate the light-emitting diode chips, with a space disposed between the encapsulation structures of adjacent light-emitting units.

11. The backlight structures defined in claim 10 wherein the largest dimension of the light-emitting units in a direction parallel to the substrate is no greater than 500 microns.

12. The backlight structure according to claim 7, wherein the at least four light emitting cells comprise four light emitting cells, and the centers of the four light emitting cells are sequentially connected to form the second square.

13. The backlight structure according to claim 7, wherein the at least four light emitting units comprise five light emitting units, and centers of four light emitting units located at the outermost edges of the five light emitting units are sequentially connected to form the second square.

14. The backlight structure according to claim 2, wherein each of the at least some of the lamp regions comprises three light emitting units, centers of the three light emitting units are sequentially connected to form a triangle, and an included angle between one of the first direction and the second direction and one side of the triangle is less than 5 degrees.

15. The backlight structure according to claim 1, wherein the thickness of the dam is greater than the height of the light emitting unit in a direction perpendicular to the substrate.

16. The backlight structure according to claim 15, wherein the thickness of the retaining wall is 200 to 400 micrometers, and the height of the light emitting unit is 50 to 100 micrometers.

17. The backlight structure according to claim 15, wherein the thickness of the retaining wall is 250 to 270 micrometers, the width of the retaining wall is 350 to 500 micrometers, and the height of the light emitting unit is 80 to 100 micrometers.

18. The backlight structures defined in claim 15 further comprising:

the flat glue is positioned between the retaining wall and the light-emitting unit and between two adjacent light-emitting units,

wherein, the thickness of concora crush is not less than the height of luminescence unit, and is less than the thickness of barricade, the concora crush is close to substrate side surface is in orthographic projection on the base plate is located completely the concora crush is kept away from substrate side surface is in orthographic projection on the base plate.

19. The backlight structure of claim 18, wherein a cross-sectional shape of a plane where the flat adhesive is connected by the centers of the two adjacent light emitting units includes a trapezoid, a length of a first bottom side of the trapezoid away from the substrate is greater than a length of a second bottom side of the trapezoid close to the substrate, a distance between end points of orthographic projections of the first bottom side and the second bottom side on the substrate, the end points being close to each other, is 17 to 32 micrometers, and the plane is perpendicular to the substrate.

20. The backlight structure according to any one of claims 1-19, wherein a side of the substrate facing away from the light emitting unit is provided with a thermally conductive glue, the thermally conductive glue having at least one opening therein.

21. The backlight structures defined in any one of claims 1-19 further comprising:

a light diffusion structure located on a side of the light emitting unit away from the substrate,

the light diffusion structure comprises at least one layer of diffusion film, and the thickness of the diffusion film is 0.05 to 0.2 mm.

22. The backlight structures defined in claim 21 further comprising:

a color conversion structure located on a side of the light diffusion structure away from the light emitting unit,

wherein the color conversion structure includes a color conversion film configured to convert first color light including blue light into second color light including at least one of red light and green light.

23. The backlight structures defined in claim 22 wherein the color conversion structures further comprise prisms on a side of the color conversion film remote from the light-emitting units.

24. The backlight structures defined in claim 22 further comprising:

a prism structure located on a side of the color conversion structure away from the light emitting unit,

the prism structure comprises at least one prism layer, and the thickness of the prism layer is 0.05 to 0.2 mm.

25. A backlight structure, comprising:

a substrate;

a dam pattern on the substrate and including a plurality of openings arranged in an array along a first direction and a second direction, the plurality of openings being configured to define a plurality of lamp regions, and a dam surrounding each of the openings, the first direction and the second direction intersecting;

the LED lamp comprises at least three light emitting units, wherein at least three light emitting units are arranged in each of at least part of the light areas, the centers of M light emitting units closest to the top corners of the light areas are sequentially connected to form an M-shaped polygon, the distance between the center of the M-shaped polygon and the center of the light areas is less than 10% of the pitch of the light areas, the ratio of different side lengths of the M-shaped polygon is 0.9 to 1.1, and the ratio of the pitch of the light areas to the side length of the M-shaped polygon is 1.7 to 2.3;

at least one side of the M-polygon is parallel to at least one of the first direction and the second direction.

26. The backlight structure defined in claim 25 wherein each of the at least some lamp regions comprises N light-emitting units, N ≧ M, and the distance from the center of the ith light-emitting unit to the top corner of the lamp region is L _i I ranges from 1 to N, L _i P and N satisfy: 8.5.5. Gtoreq.Px (1/L) ₁ +1/L ₂ +…+1/L _N )≥6.3。

27. The backlight structure according to claim 25, wherein the luminous intensity distribution I of the light emitting unit satisfies: i = I ₀ cosmα，I ₀ Is the luminous intensity distribution in the normal direction perpendicular to the light-emitting surface of the luminous unit, alpha is the included angle between the luminous direction of the luminous unit and the normal, and m = (-ln 2)/(lncos alpha) _1/2 )，α _1/2 The included angle between the light emitting direction and the normal when the light emitting intensity is reduced to half of the light emitting intensity corresponding to the normal direction is set, and the optical path of the light emitted by the light emitting unit in the normal direction is h;

each lamp zone of at least part of the lamp zones comprises N light-emitting units, N is more than or equal to M, and the distance from the center of the ith light-emitting unit to the vertex angle of the lamp zone is L _i I ranges from 1 to N, L _i H and N satisfy:

28. the backlight structures defined in claim 25 wherein the ratio of the intensity of light at the edge positions of the lamp regions to the intensity of light at the center positions of the lamp regions is not less than 0.5.

29. The backlight structures defined in claim 25 wherein each of the at least some of the lamp regions comprises at least four light-emitting units arranged in the M-sided polygon, one of the first and second directions making an angle of 0 degrees with at least one side of the M-sided polygon.

30. The backlight structure defined in claim 29 wherein each of the at least some light zones is shaped as a first square, each of the at least some light zones comprises at least four light-emitting units, the M-polygon is a second square, and the diagonal of the first square makes an angle of 0 degrees with the diagonal of the second square.

31. The backlight structure defined in claim 30 wherein the at least four light-emitting units comprise four light-emitting units, the centers of the four light-emitting units being connected in sequence to form the second square.

32. The backlight structures defined in claim 29 wherein each of the at least some of the lamp regions comprises three light-emitting units, the centers of the three light-emitting units being connected in sequence to form a triangle, one edge of the triangle extending in the first direction or the second direction.

33. The backlight structure according to any one of claims 25-32, wherein the light emitting cells disposed in each lamp region are electrically connected, and the dam comprises a light blocking material.

34. The backlight structures defined in any one of claims 25-32 wherein the light-emitting units comprise light-emitting diode chips and encapsulation structures configured to encapsulate the light-emitting diode chips, with a space being provided between encapsulation structures of adjacent light-emitting units.

35. The backlight structures defined in claim 34 wherein the largest dimension of the light-emitting cells in a direction parallel to the substrate is no greater than 500 microns.

36. The backlight structures defined in any one of claims 25-32 wherein at least a portion of the lamp regions comprise a rectangle having two adjacent sides that extend in the first and second directions, respectively.

37. The backlight structure according to any one of claims 25 to 32, wherein the thickness of the retaining wall is 250 to 270 micrometers, the width of the retaining wall is 350 to 500 micrometers, and the height of the light emitting unit is 80 to 100 micrometers.

38. The backlight structures defined in any one of claims 25-32 further comprising:

the thickness of the flat glue is not smaller than the height of the light-emitting unit and smaller than the thickness of the retaining wall, the flat glue is close to the orthographic projection of one side surface of the substrate on the substrate and is completely located, the flat glue is far away from the orthographic projection of one side surface of the substrate on the substrate.

39. The backlight structure of claim 38, wherein a cross-sectional shape of a plane where the flat adhesive is connected by the centers of the two adjacent light emitting units includes a trapezoid, a length of a first bottom side of the trapezoid away from the substrate is greater than a length of a second bottom side of the trapezoid close to the substrate, a distance between end points of orthographic projections of the first bottom side and the second bottom side on the substrate, the end points being close to each other, is 17 to 32 micrometers, and the plane is perpendicular to the substrate.

40. A display device, comprising:

display panel, and

the backlight structures defined in any one of claims 1-39,

the display panel is located on the light emitting side of the backlight structure.